TC reported intermintent APS fault at Front M2 car 2688. TC feedback train performance was ok. TC re ported intermintent APS fault at Front M2 car 2688. TC feedb ack train performance was ok. ~~~~~ TC reported intermintent APS fault at Front M2 car 2688.  Checked found 2688 1-2 UVW shorted to ground. Isolated UVW wiring and tagged. Notification to HM to replace new CCU. Notification to HM: 2534690. Done by Sateesh, Shah. 20/10/2023.