Train doors at car 3623 were not provenclosed. TC opened and closed once to clear fault. ~~~~~ #3623-B2 door close operation timeout. FC 953. ER download & fault trace at PTU006. Mating strip before adjutment: Top: 61.3, Mid: 62.6, Bottom: 62.3, all failed criteria. Push/Pull-LHS: 7.5, RHS: 7.0. Remove door check roller RHS-ok, LHS-Found one big roller faulty. Replace LHS big roller. Mating strip after adjustment: Top: 63.2, Mid: 64.3, Bottom: 63.8. Push/Pull-LHS & LHS- 4.4kg. DCS to plate: 14.8 no rubbing mark. No FOD at guide rail, J-rail. Adjusted DLS-ok. DLD, DLS, DSC function ok. Conducted door cyclic test 15x ok. No recurrence of fault. Door opening 3.2sec & closing 3.3sec. Done by Zulq/Asruddin/Haslan/Saini.  01/12/20.