1503 Having BCU fault(Train Prep). To ch ~~~~~ Check tims no fault. Brake cyclic check no occurence of fault. Further check wheel condition and breakes release when put to coast. PM swapped #1503 ACU (1302/132) to #2503 (1244/108). Secure and function check brake cyclic test done ok. Fault transfered to #2503 once stabled at siding. OPS 20 raised for ACU C/O.  Jimmy / Teh / Genesan 15.11.2023   C/O done. Function test ok. Security check ok.  Danial 15.11.2023 ACU S/N: OLD: 1302/132 NEW: 1047/029 Notif: 2542737