diff --git a/CMakeLists.txt b/CMakeLists.txt
index 40c0b879..6328f176 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -71,7 +71,7 @@ set(FSFW_ETL_LIB_MAJOR_VERSION
     20
     CACHE STRING "ETL library major version requirement")
 set(FSFW_ETL_LIB_VERSION
-    ${FSFW_ETL_LIB_MAJOR_VERSION}.27.3
+    ${FSFW_ETL_LIB_MAJOR_VERSION}.28.0
     CACHE STRING "ETL library exact version requirement")
 set(FSFW_ETL_LINK_TARGET etl::etl)
 
@@ -185,7 +185,7 @@ endif()
 message(STATUS "${MSG_PREFIX} Finding and/or providing ETL library")
 
 # Check whether the user has already installed ETL first
-find_package(${FSFW_ETL_LIB_NAME} ${FSFW_ETL_LIB_MAJOR_VERSION} QUIET)
+find_package(${FSFW_ETL_LIB_NAME} ${FSFW_ETL_LIB_MAJOR_VERSION} CONFIG QUIET)
 # Not installed, so use FetchContent to download and provide etl
 if(NOT ${FSFW_ETL_LIB_NAME}_FOUND)
   message(
diff --git a/hal/src/fsfw_hal/linux/spi/SpiComIF.cpp b/hal/src/fsfw_hal/linux/spi/SpiComIF.cpp
index dcf92b5d..b06def69 100644
--- a/hal/src/fsfw_hal/linux/spi/SpiComIF.cpp
+++ b/hal/src/fsfw_hal/linux/spi/SpiComIF.cpp
@@ -210,7 +210,7 @@ ReturnValue_t SpiComIF::performRegularSendOperation(SpiCookie* spiCookie, const
 #endif
       return result;
     }
-    ReturnValue_t result = gpioComIF->pullLow(gpioId);
+    result = gpioComIF->pullLow(gpioId);
     if (result != HasReturnvaluesIF::RETURN_OK) {
 #if FSFW_VERBOSE_LEVEL >= 1
 #if FSFW_CPP_OSTREAM_ENABLED == 1
diff --git a/src/fsfw/osal/rtems/MessageQueue.cpp b/src/fsfw/osal/rtems/MessageQueue.cpp
index f52f1852..534015dc 100644
--- a/src/fsfw/osal/rtems/MessageQueue.cpp
+++ b/src/fsfw/osal/rtems/MessageQueue.cpp
@@ -65,7 +65,7 @@ ReturnValue_t MessageQueue::sendMessageFrom(MessageQueueId_t sendTo, MessageQueu
   }
 
   ReturnValue_t returnCode = convertReturnCode(result);
-  if (result == MessageQueueIF::EMPTY) {
+  if (returnCode == MessageQueueIF::EMPTY) {
     return HasReturnvaluesIF::RETURN_FAILED;
   }
 
diff --git a/src/fsfw/osal/rtems/MessageQueue.h b/src/fsfw/osal/rtems/MessageQueue.h
index bb31a508..f64a3d83 100644
--- a/src/fsfw/osal/rtems/MessageQueue.h
+++ b/src/fsfw/osal/rtems/MessageQueue.h
@@ -36,7 +36,7 @@ class MessageQueue : public MessageQueueBase {
    * @param max_message_size	With this parameter, the maximum message size can be adjusted.
    * 							This should be left default.
    */
-  MessageQueue(size_t message_depth = 3,
+  explicit MessageQueue(size_t message_depth = 3,
                size_t max_message_size = MessageQueueMessage::MAX_MESSAGE_SIZE,
                MqArgs* args = nullptr);
 
@@ -48,13 +48,15 @@ class MessageQueue : public MessageQueueBase {
    * @brief	The destructor deletes the formerly created message queue.
    * @details	This is accomplished by using the delete call provided by the operating system.
    */
-  virtual ~MessageQueue();
+  ~MessageQueue() override;
 
   // Implement non-generic MessageQueueIF functions not handled by MessageQueueBase
   ReturnValue_t flush(uint32_t* count) override;
+
+  ReturnValue_t receiveMessage(MessageQueueMessageIF* message) override;
   ReturnValue_t sendMessageFrom(MessageQueueId_t sendTo, MessageQueueMessageIF* message,
-                                MessageQueueId_t sentFrom = NO_QUEUE,
-                                bool ignoreFault = false) override;
+                                MessageQueueId_t sentFrom,
+                                bool ignoreFault) override;
 
  private:
   /**
diff --git a/src/fsfw/osal/rtems/QueueFactory.cpp b/src/fsfw/osal/rtems/QueueFactory.cpp
index 2519f444..074ce273 100644
--- a/src/fsfw/osal/rtems/QueueFactory.cpp
+++ b/src/fsfw/osal/rtems/QueueFactory.cpp
@@ -45,9 +45,9 @@ QueueFactory* QueueFactory::instance() {
   return factoryInstance;
 }
 
-QueueFactory::QueueFactory() {}
+QueueFactory::QueueFactory() = default;
 
-QueueFactory::~QueueFactory() {}
+QueueFactory::~QueueFactory() = default;
 
 MessageQueueIF* QueueFactory::createMessageQueue(uint32_t messageDepth, size_t maxMessageSize,
                                                  MqArgs* args) {
diff --git a/src/fsfw/pus/Service11TelecommandScheduling.tpp b/src/fsfw/pus/Service11TelecommandScheduling.tpp
index cb43e8e8..5ce6f744 100644
--- a/src/fsfw/pus/Service11TelecommandScheduling.tpp
+++ b/src/fsfw/pus/Service11TelecommandScheduling.tpp
@@ -615,23 +615,24 @@ inline ReturnValue_t Service11TelecommandScheduling<MAX_NUM_TCS>::handleInvalidD
 
 template <size_t MAX_NUM_TCS>
 inline void Service11TelecommandScheduling<MAX_NUM_TCS>::debugPrintMultimapContent() const {
-  for ([[maybe_unused]] const auto &dit : telecommandMap) {
 #if FSFW_DISABLE_PRINTOUT == 0
 #if FSFW_CPP_OSTREAM_ENABLED == 1
-    sif::debug << "Service11TelecommandScheduling::debugPrintMultimapContent: Multimap Content"
-               << std::endl;
+  sif::debug << "Service11TelecommandScheduling::debugPrintMultimapContent: Multimap Content"
+             << std::endl;
+#else
+  sif::printDebug(
+      "Service11TelecommandScheduling::debugPrintMultimapContent: Multimap Content\n");
+#endif
+  for (const auto &dit : telecommandMap) {
+#if FSFW_CPP_OSTREAM_ENABLED == 1
     sif::debug << "[" << dit.first << "]: Request ID: " << dit.second.requestId << " | "
                << "Store Address: " << dit.second.storeAddr.raw << std::endl;
 #else
-    sif::printDebug(
-        "Service11TelecommandScheduling::debugPrintMultimapContent: Multimap Content\n");
-    for (auto dit = telecommandMap.begin(); dit != telecommandMap.end(); ++dit) {
-      sif::printDebug("[%d]: Request ID: %d  | Store Address: %d\n", dit->first,
-                      dit->second.requestId, dit->second.storeAddr);
-    }
-#endif
+      sif::printDebug("[%d]: Request ID: %d  | Store Address: %d\n", dit.first,
+                      dit.second.requestId, dit.second.storeAddr);
 #endif
   }
+#endif
 }
 
 template <size_t MAX_NUM_TCS>