Train doors not proven closed at rear M2car B2 door. TC opened and closed once to clear fault. AT S BW2 staff observed at platform of train door - ok. Train doors not proven closed at rear M2 car B2 door. TC opened and c ~~~~~ 2510 B2 Train doors not proven close. TC opened and closed once to clear fault. AT SBW2 staff observed at platform of train door - ok. CE : 2510 B2 door proven closed n no DIR fault. Pls check door operations at depot.  2510 B2 door found RHS & LHS rollers damaged. Replaced all 4 rollers. Conducted door cyclic test test 10x. Doors were fully closed & no DIR lit up. Checked door static test - Passed.  Aliff/Daniel/Redzwan/Chan SW 45454