Train doors at rear M2 car were not proven closed. TC recycled train doors once to clearfault - ok . Train doors at rear M2 car were not proven closed. TC recy cled train doors once to clearfault - ok. ~~~~~ 2544 Train doors were not proven closed. TC recycled train doors once to clear fault - ok. CE unable to board.  2544 checked/found B1/B4 door rollers damaged badly. Doors operation was noisy when closing. OPS 20 raised to follow-up.  Azmi/Fazly/Farid 45295 2544 - B1 & B4 door roller c/o.  2544 Checked B1 & B4 saloon doors rollers pitted badly. Replaced damaged rollers. Clean J-rail, no FOD found on door guide. Perform 10/20mm door test - OK. Door function test - OK.  Sarma/Sugu/Anand/Kamarul/Alan 45296