Train doors at car 1612, A1 door were not proven closed. TC opened and closed a few times but fault persisted. Staff (KRJ) assisted to push closed. ~~~~~ L3   Replaced #1612 L/S door roller (A1). Mating strip top = 63.9, Centre = 64.8, Bottom = 63.8. Push/pull both door 6.0kgf. P.S.S ok. DLS ok. No wobbling/vibrating. Perform 20 times cyclic door test ok. Done by Koh/Saini. 3/11/20.