Train doors at RDT car were not proven closed. TC opened and closed a few times but fault persisted.Staff (ADM) assisted. TC did platform duty and operated the ESDC to clear fault. ~~~~~ Checked ER and fault trace, fault occurred once. Checked door resistance ok. Door mating strip distance: Top = 64.0, Middle = 63.5, Bottom = 64.0, all ok. Cleaned and lubricated J-rail and bottom door guide ok. Door cyclic test ok. Checked by Ting Wei. 11/12/20.