Front DT car 'A4' train doors were not proven closed. TC opened and closed a few times to clear faul t. Staff (BGB) checked and confirmed no abnormalities at BGB 1. Station staff also reported fault recurred at BBT1 and JU ~~~~~ #3629-A4 door mating strip before adjustment: Top=63.3mm  Mid=64.4  Bottom=63.8mm. Push pull gauge Resistance LHS: 5.4kg. RHS: 4.8kg. DLS check ok. Door remove and found LHS 1 roller rubber give way against the bearing. Done by Jack/Sanip/Faddzal/Firduas.  09/11/20. #3629-A4 door LHS roller (big) replace. Push/Pull-5kg. Door mating: Top: 63.1mm  Mid:64.4mm  Bottom: 63.7mm. Check DCS to plate: 15mm. DCS, DLD, DLS check ok. Door open/close timing: 3.3sec. Door cyclic tested ok. To monitor on M/L. #1685-A3 door RHS big roller cannibalise to service #3629-A4 LHS door roller (WO:1891346 to replace on #1685). Done by Saini/Asruddin/Haslan/Zulq. 09/11/20.