Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r05b4d416b6bd5e7af4347f112a20f9f81a257064 -r3e525c0567dd0b7d2153b751169d0ae17648e117
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 05b4d416b6bd5e7af4347f112a20f9f81a257064)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 3e525c0567dd0b7d2153b751169d0ae17648e117)
@@ -99,7 +99,8 @@
  *************************************************************************/
 static U32 serializeMessage( MESSAGE_T msg, COMM_BUFFER_T buffer, BOOL ackReq )
 {
-    BOOL result;
+    BOOL result = 0;
+    BOOL error = FALSE;
     U32 msgSize = 0;
     U32 sizeMod, sizePad;
     U32 i;
@@ -153,13 +154,17 @@
     {
         if ( FALSE == addMsgToPendingACKList( &msg, buffer, data, msgSize ) )
         {
-            // TODO - ???
+            error = TRUE;
+            SET_ALARM_WITH_1_U32_DATA( ALARM_ID_SOFTWARE_FAULT, SW_FAULT_ID_MSG_PENDING_ACK_LIST_FULL )
         }
     }
 #endif
 
-    // add serialized message data to appropriate out-going comm buffer
-    result = addToCommBuffer( buffer, data, msgSize );
+    if ( FALSE == error )
+    {
+        // add serialized message data to appropriate out-going comm buffer
+        result = addToCommBuffer( buffer, data, msgSize );
+    }
 
     return result;
 }
@@ -466,7 +471,7 @@
     // create a message record
     blankMessage( &msg );
     msg.hdr.msgID = MSG_ID_PRESSURE_OCCLUSION_DATA;
-    msg.hdr.payloadLen = sizeof( PERISTALTIC_PUMP_STATUS_PAYLOAD_T );
+    msg.hdr.payloadLen = sizeof( PRESSURE_OCCLUSION_DATA_T );
 
     payload.arterialPressure = artPres;
     payload.venousPressure = venPres;