Train door at Rear M2 car 'A2' not proven closed. TC recycled train door twice but to no avail. Staf f(CTH) boarded the train and confirmed Rear M2 'A2' door notproven closed. Staff(CTH) pushed closed for train to depart  ~~~~~ * ,N * '1. Fault confirmed / Fault cannot be duplicated Fault able to be duplicated in depot. Door operataion was wobbly and doors intermittently unable close. 2. What was found from ER / Fault trace? TIMS showed FC083 occured thrice: 3628 A4 saloon door close operation timeout - CLE. 3. Troubleshooting Details These are the 5 identified possible causal factors based on FTA: A. Faulty door rollers Likely Found 3628 A4 Saloon Door RHS outer roller delaminated. B. External Obstruction Unlikely No signs of FOD was found. No signs of scratch marks on guide rail. C. Internal Obstruction Unlikely Weather strips were in good condition and there were no door rubbing marks found. No abnormal sounds were heard during cyclic test. D. Door motor faulty Unlikely Door motor was able to open and close doors with no abnormalities nor unusual sounds. E. Door lock switch (DLS) or door close switch (DCS) faulty Unlikely Door Close Switch distance from actuating plate satis. DIR and DMI able to extinguish during door cyclic test. DLS red line checked satis when door is closed. DLS cushion rubber intact. DLS went down fully after door close command. Rectifcation Details * Replaced #3628 A4 RHS and LHS main door rollers to iron rollers. * Door push/pull resistance force ok. * Door operation was smooth without wobbling. * Cyclic test ok; DIR and DMI able to extinguish. * Door static test timing within criteria. * Door mating strip distance satis. * Ensured DLS lock nut and other fasteners were secured. * Serviced J-rail and guide rail preventively. DONE BY:LAI/ZAIDI/IDRIS/RIDZUAN 14.02.2024