Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r833f85644d027627769a92126402be2e0f4e69af -r1ededb9ae1cbc2c14a09fd2a4370f060569de158
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 833f85644d027627769a92126402be2e0f4e69af)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 1ededb9ae1cbc2c14a09fd2a4370f060569de158)
@@ -8,7 +8,7 @@
 * @file    SystemCommMessages.c
 *
 * @author  (last)      Michael Garthwaite
-* @date    (last)      15-Aug-2023
+* @date    (last)      17-Aug-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
@@ -1719,6 +1719,30 @@
 
 /*********************************************************************//**
  * @brief
+ * The sendDGParkConcentratePumpsCommand function constructs a DG concetentrate
+ * pumps park request msg to the DG and queues the msg for transmit on the appropriate CAN channel.
+ * @details Inputs: none
+ * @details Outputs: DG park concentrate pumps command msg constructed and queued..
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendDGParkConcentratePumpsCommand( void )
+{
+    BOOL result;
+    MESSAGE_T msg;
+
+    // Create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_DG_PARK_CONCENTRATE_PUMPS_CMD_REQUEST;
+    msg.hdr.payloadLen = 0;
+
+    // Serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_DG, ACK_REQUIRED );
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
  * The sendDGStartFlushModeCommand function constructs a DG start/stop
  * flush mode command message and queues the msg for transmit on the
  * appropriate CAN channel.
@@ -8424,4 +8448,36 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
+/*********************************************************************//**
+ * @brief
+ * The handleTestHDPendingACKOverrideRequest function handles a
+ * request to override pending ACKs.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message : a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleTestHDPendingACKOverrideRequest( MESSAGE_T *message )
+{
+    TEST_OVERRIDE_PAYLOAD_T payload;
+    BOOL result = FALSE;
+
+    // Verify payload length
+    if ( sizeof( TEST_OVERRIDE_PAYLOAD_T ) == message->hdr.payloadLen )
+    {
+        memcpy( &payload, message->payload, sizeof( TEST_OVERRIDE_PAYLOAD_T ) );
+        if ( FALSE == payload.reset )
+        {
+            result = testSetPendingACKOverride( payload.state.u32 );
+        }
+        else
+        {
+            result = testResetPendingACKOverride();
+        }
+    }
+
+    // Respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
+
 /**@}*/