Train doors at rear M1 not proven closed. Open and closed few times - no avail. Staff feedback rear M1, B2 door wide opened. Passenger disembarked. ~~~~~ Train doors at rear M1 not proven closed     #1623-B2 door before cleaning do push/pull resistance & wobbling test ng.Check mating strip,OK.DLS red mark visible.Remove door and change bearing roller on LHS door due to roller spoilt. After cleaning done Push/pull resistance,Mating strip,DLS red mark,DCS,DLD function test all within criteria.Door opening/closing/timing/Static test-all pass.No FOD and door rubbing mark found. Done by Haslan/Johari. 25/01/23