TC change end and reported train encountered BCU BCP fault at Rear M2 car. TC feedback train perform ance was ok. TC change end and reported train encountered BC U BCP fault at Rear M2 car. TC feedback train performance wa ~~~~~ 2509 TC reported train encountered BCU BCP fault. TC feedback train performance was ok.  2509 FC 330 registered. Bog 1 BCU Fault. 2509 brake slow release. Swapped 2509 ACU with 2510. Replaced 2510 ACU with new. Swapped 2509 BCP1 cable with 1510. Tested brake operation for residual pressure at coast - OK. Limited & depot shunting - OK. Sarma/Alan/Kamar/Anand/Shafie 44872