BCU fault at RM2 car. TC put to ATPMN toclear fault. ~~~~~ BCU fault at RM2 car. TC put to ATPMN to     #1556 FC 308/330/331 at the reported time.#556 no fault code during reported time.Brake cyclic test check ACU no abnormalities onair leak test.Observed #1556 at EM pressure 2.66~2.75.Swap control pressure transmitter 1556/2556.Brake at EM pressure still at #1556.Swap ACU 2556/1556 fault transfer.Replaced #1556 ACU and brake cyclic test ok.BCP within criteria. ACU-New s/n: 1042-075  Old s/n: 1244-107 Not: 2317647 raise to RSW. Done by Asruddin/Saini/Zulq. 26/9/21