Train doors at rear DT car were not proven closed. TC recycled train doors once - ok. Fault did not recur at subsequent stations. ~~~~~ Train doors at rear DT car were not prov     #3616-B2 door FC 953x2,956x1.Check found LHS & LHS door main 2x roller damage-replaced 4x main roller done.Service and check all component measure all within criteria.Door cyclic function and static test ok. During static test also found #1615-B4 door no good.Door unable to open and door wobbly further check found both side roller delaminated.Require to c/o both RHS/LHS roller. Ops 0020 raise. Done by Zulq/Asruddin. 14/04/23 1615 B4 door to change out LHS/RHS main roller due delaminated Check and found #3615-A2 door LHS,#1615-B4 door LHS,#2615-A1 door LHS and B1 RHS outer door roller damage and c/o done.Mating strip,push/pull ,DLS,DSS,Door tatic and door function test ok. Done by Koh/Sanip/Rizman. 14/04/23