TC reported BCU fault at rear M1 car bogie no1. Brake status check ok. ~~~~~ #1539 FC 331,330,308 FAULT U BLE TO DUPLICATED.BCP OK.BRAKE CYCLIC TEST OK.PREVENTIVE 2539 ACU SWAP TO 1539 AND C/O 2539 ACU FUNCTION TEST,BCP OK.BRAKE CYCLIC TEST OK. GANESAN/TEH/JIMMY/RAGHU 21.12.2023 SWAP ACU 2539 (1301-055) TO 1539. #1539 ACU C/O S/N OLD 1307-055     NEW 1302-130 NOTIFICATION 2553495