Train doors at car 3623 were not provenclosed. TC recycled train doors a few- ok. Staff(SIM) chec ked and confirmed no train doors abnormalities. Fault recurr ed at BDK WB car 3263 'B1' door. Staff(KEM) isolated B1 door ~~~~~ 3623 SALOON DOOR B1 CHECK DOOR ROLLER GOOD CONDITION NO FOD FOUND.DOOR TIMING OK.SWAP DCP FROM 3623 B1(1503W0200115010) TO 1623 B1(1503W0200115011).RAISED OPS20 TO C/O DCP DUE TO NO SPARE.FAULY TRANFER TO 1623 B1 DOOR. LOW KC/HARIHARAN/LEONG/HAFIZ R 04.06.2023  SPARE COLLECTED FROM UPD.C/O 1623 DCP B1 DOOR COMPLETED.SECURITY/FUNCTION CHECK OK .DOOR CYCLIC TEST 20X OK.DIR ABLE TO EXTINGUSHER ON CLOSE.FARHAN 05.06.2023 NEW DCP  1412W0200015039 OLD DCP  1503W0200115010 NOTIFICATION 2494681