Train doors at car1641 A3 door were notproven closed. TC recycled the train doors a few times for t rain to depart. Staff(BBT) checked and confirmed that car 16 42 'A3' doors were proven closed. No abnormalities ~~~~~ 1641 A3 Train doors were not proven closed. TC recycled the train doors a few times for train to depart. Staff(BBT) confirmed 1642 'A3' doors were proven closed. No abnormalities CE feedback All doors proven closed. No DIR lit. OE depot check.  1641 A3 door found no FC on TIMS. Checked door guide & found no FOD. No abnormalities found on door mechanism. Conducted open/close doors 20x - OK. Doors able to operate normally & DIR extinguished when doors closed. OPS 20 raised to further check.     Fazly/Faiz/Farid/Rajamohan 44792 To futher rectify.  1641 A3 door checked/found J-rail stubborn dirt stuck. Cleaned J-rail & checked both door rollers - OK. Function check all doors - OK, no DIR.  Alan/Lee PT 44792