Train doors at car 3635, A3, were not proven closed. TC opened and closed a few times to clear fault. ~~~~~ Train doors at car 3635, A3, were not pr     Checked and found no FOD fault code CLEX2 occurance.TC cycled door 3 times to clear fault.ER & fault trace in PTU 007.Fault trace shows gap of 68mm.In the depot,found door resistance high,at 11kgf.Cleaned away accumulation of dust on top J rail,Checked door resistance,5kgf.Cycled doors,fault did not recur.Checked door mating strip,top/mid/bottom. 63.5/64/63mm ok.To be monitored in M/L. Checked by Ting Wei.  09/11/20