Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -rdaaf76c5b69282cb044896b7722c73ac7c89f1a1 -rd4a90fda6c1f463633a4e7d45424acd2d2a0bce8
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision daaf76c5b69282cb044896b7722c73ac7c89f1a1)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision d4a90fda6c1f463633a4e7d45424acd2d2a0bce8)
@@ -569,7 +569,7 @@
  * @param drainToVolumeMl volume (in mL) to drain the inactive reservoir to
  * @return TRUE if msg successfully queued for transmit, FALSE if not
  *************************************************************************/
-BOOL sendDGDrainCommand( U32 drainToVolumeMl )
+BOOL sendDGDrainCommand( DRAIN_RESERVOIR_CMD_PAYLOAD_T *drainCmdPtr )
 {
     BOOL result;
     MESSAGE_T msg;
@@ -578,9 +578,9 @@
     // create a message record
     blankMessage( &msg );
     msg.hdr.msgID = MSG_ID_DG_DRAIN_CMD;
-    msg.hdr.payloadLen = sizeof( U32 );
+    msg.hdr.payloadLen = sizeof( DRAIN_RESERVOIR_CMD_PAYLOAD_T );
 
-    memcpy( payloadPtr, &drainToVolumeMl, sizeof( U32 ) );
+    memcpy( payloadPtr, drainCmdPtr, sizeof( DRAIN_RESERVOIR_CMD_PAYLOAD_T ) );
 
     // 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 );