Train doors at Rear DT were not proven closed. TC recycled train doors once - ok. Fault did not recu r at subsequent stations. ~~~~~ 3543 - A1 DOOR ROLLER TO C/O.  3543 A1 door replaced both RHS door rollers & 1 LHS outer door roller. Security/function checked - OK. Door cyclic test, door gauge check, weather strip condition, door timing check - OK. Cleaned J-rail/guide rail. All doors proven closed & no DIR indication lit up.  Shafie/Lee PT/Sarma/Alan 45025 3543 Train doors were not proven closed. TC recycled train doors once - ok. Fault did not recur at subsequent stations.  3543 replaced A4 door LHS & RHS door rollers. OPS 20 raised to replace #3543 A1 door rollers.  Tarmadzi/Syahid/Faiz/Elfyan 45022