Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r44a100f8e5210a02c23b8fcc4527d8e96d577381 -r6820043b5dc623a84e7323168dd1d4bd9815e859
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 44a100f8e5210a02c23b8fcc4527d8e96d577381)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 6820043b5dc623a84e7323168dd1d4bd9815e859)
@@ -757,9 +757,42 @@
     // Serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
     return serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_UI, ACK_REQUIRED );
 }
-
+
 /*********************************************************************//**
  * @brief
+ * The sendTreatmentLogEventData function constructs a treatment log parameter
+ * change event data message for UI and queues the msg for transmit on the
+ * appropriate CAN channel.
+ * @details Inputs: none
+ * @details Outputs: Treatment log alarm event data msg constructed and queued.
+ * @param event ID of parameter change event
+ * @param oldValue parameter change event old data value
+ * @param newValue parameter change event new data value
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendTreatmentLogEventData( EVENT_ID_T event, F32 oldValue, F32 newValue )
+{
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+    U32 eventID = (U32)event;
+
+    // Create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_HD_TREATMENT_LOG_EVENT;
+    msg.hdr.payloadLen = sizeof( EVENT_ID_T ) + 3 * sizeof( F32 );
+
+    memcpy( payloadPtr, &eventID, sizeof( U32 ) );
+    payloadPtr += sizeof( U32 );
+    memcpy( payloadPtr, &oldValue, sizeof( F32 ) );
+    payloadPtr += sizeof( F32 );
+    memcpy( payloadPtr, &newValue, sizeof( F32 ) );
+
+    // Serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    return serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_UI, ACK_REQUIRED );
+}
+
+/*********************************************************************//**
+ * @brief
  * The handleSampleWaterCmd function handles a sample water user action command
  * message from the UI.
  * @details Inputs: none
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r5e650bc96230e209560abfe290f1ec93e1667d82 -r6820043b5dc623a84e7323168dd1d4bd9815e859
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 5e650bc96230e209560abfe290f1ec93e1667d82)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 6820043b5dc623a84e7323168dd1d4bd9815e859)
@@ -274,6 +274,9 @@
 // MSG_ID_HD_ACTIVE_ALARMS_LIST_REQUEST_RESPONSE
 BOOL sendActiveAlarmsList( BOOL accepted, U32 reason, U32 *alarmList, U32 size );
 
+// MSG_ID_HD_TREATMENT_LOG_EVENT
+BOOL sendTreatmentLogEventData( EVENT_ID_T event, F32 oldValue, F32 newValue );
+
 // *********** public DG command functions **********
 
 // MSG_ID_SET_DG_DIALYSATE_TEMP_TARGETS