Train doors at car Rear M1 car were notproven closed. TC recycled train doors once - ok. Fault did not recur at subsequent stations. ~~~~~ 1530 Train doors were not proven closed. TC recycled train doors once - ok. Fault did not recur at subsequent stations.  1530 found B1/B2 saloon door rollers damaged/worn-out. Replaced #1530 B2 LHS door roller. Security/function test - OK. Door cyclic test & door gauge test - OK. OPS 20 raised to replace #1530 B2 RHS & B1 LHS & RHS door rollers due to no spares were available.  Sarma/Lee PT/Sugu/Anand/Kamarul 44909 To follow-up.  1530 B2 RHS & #1530 B1 LHS/RHS door rollers replaced. Security/function test - OK. Door cyclic test & door gauge test - OK. Doors were proven closed.  Sarma/Sugu/Lee PT/Kamarul/Anand/Shafie 44910