TC reported Rear DT Car 'B4' door havingdifficulties closing. Fault recurred ORC1. TC recycled once to clear fault. SM (ORC) later feedback there was a small g ap at Rear DT car 'B4' door. SM (ORC) assisted to push close ~~~~~ 3643 TC reported 'B1' door having difficulties in closing. Fault recurred ORC1. TC recycled once to clear fault. SM (ORC) feedback there was a small gap at B1 door. SM (ORC) assisted to push close for train to depart at NEW1. SM (ORC) isolated the affected train door at NOV1. AMK NB.  3643 FC 933 B1 door close operation time out. Roller condition ok: N, Check and found B1, both outer and inner RHS  rollers delaminated, on LHS ok - replaced all 4 rollers. Open Close speed pass: Y, after rectification FOD found:  N Door cycle 20x: Y, after rectification Rubbing marks: N Door Push/Pull force: ok, after rectification Door mating gap: ok Check Door Lock Switch red line when door closed  - ok Door Lock Switch Cushion Rubber intact: Y Door Close Switch distance from actuating plate - ok Door Wobble: N, after rectification Rectification Actions: DMI and DIR able to light and extinguish accordingly. Cyclic test all door operation at car 3643  were smooth with no abnormal sounds nor wobbling. Door open/close speed satis. Preventively serviced J-rail and guide rail.  Sarma/Alan/Kamarul 45469