Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r81bfada185cac9374939aa6bd89687cb14e83ac3 -r23ebb5812ecd93ca42999259f7f62f46fd482ebd
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 81bfada185cac9374939aa6bd89687cb14e83ac3)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 23ebb5812ecd93ca42999259f7f62f46fd482ebd)
@@ -8,7 +8,7 @@
 * @file    SystemCommMessages.c
 *
 * @author  (last)      Dara Navaei
-* @date    (last)      20-Oct-2023
+* @date    (last)      01-Mar-2024
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
@@ -5164,4 +5164,32 @@
     // respond to request
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
+
+/*********************************************************************//**
+ * @brief
+ * The handleTestRunModeFillForCalibrationCheck function handles a request
+ * to run the mode fill for calibration check (0 = prime, 1 = bicarb test,
+ * 2 = acid test)
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleTestRunModeFillForCalibrationCheck( MESSAGE_T* message )
+{
+    BOOL result = FALSE;
+
+    if ( sizeof(U32) == message->hdr.payloadLen )
+    {
+        U32 modeFillForCalibrationState;
+
+        memcpy( &modeFillForCalibrationState, message->payload, sizeof(U32) );
+
+        result = testSetModeFillForCal( modeFillForCalibrationState );
+    }
+
+    // respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
+
 /**@}*/