FM1 and FM2 cars BCU fault. Fault self cleared. ~~~~~ 1556 and 2556 cars BCU fault. Fault self cleared. (0933 hrs & 0937 hrs)  2556 BCU swapped with #2532. Function check - OK. Air leak test = 0.5 bar/5 min. OPS 20 raised to follow-up.  Redzwan 44420 BCU S/N (After Swap) : #2556 : 1815138 #2532 : 1809050 To follow up.  1556 ACU replaced. Brake pressure check - OK. (checklist attached) No brake fault during depot shunting. OPS 30 raised to follow-up.  Alan/Lee PT 44420 #1556 ACU S/N : OLD : 1302/126 NEW : 1032/043 Mainline Test.  555/556 M/L test from UPD-JKN-UPD. Brake fault occurred once on #2556 (FC 308/330, 01:00:21-01:01:03). ER D/L & Dynamic test - Done. OPS 40 raised to follow-up.  Sarma 44421 To Continue Rectification.  1555 ACU found having abnormal noise.    Replaced #1555 ACU. #2556 transducer 3(BCP 1). OPS 50 raised to follow-up.  Alan/Lee PT/Shafie 44421 #1555 ACU S/N : OLD : 1012/015 NEW : 1024/033 To follow up.  1556 stuck brake. Replaced ACU & checked no air leak found on ACU. Air leak test = 0.5 bar/5 min. Function check - All OK. OPS 60 raised for M/L test.  Alan 44422 #1556 ACU S/N : OLD : 1032/043 NEW : 1244/106 555/556 - Mainline Test.  555/556 M/L test from UPD-JKN-UPD - OK. No brake fault found at all cars.  Au TK 44423