Train doors at car 3501 were not provenclosed. TC recycled train doors thrice - ok. Staff(DVR) checked and confirmed no train doors abnormalities. Fault did no t recur at subsequent stations. Train doors at car 3501 were ~~~~~ * ,N * 1. Fault confirmed/ Fault cannot be duplicated 3501 A3 DOOR unable to duplicate in depot 2. What was found from ER/ Fault Trace No FC registered. 3. Troubleshooting details Probable Causal Factors These are 6 identified causal factors based on FTA: A. Faulty Rollers Likely Checked both door leaves. Found 3501 A3 LHS/RHS  door rollers damaged. Movement of saloon door not smooth. B. External Obstruction Unlikely Checked J-rail and door guide rail and found it clear of obstruction. C. Internal Obstruction Unlikely No door rubbing marks observed. Weather strips are secured. Condition of weather strips are good. No abnormal noise from J-rail. D. Door close sensing switch rigging Unlikely Conducted 10/20mm gauge at 3501 A3, passed. Conducted door cyclic test 20x, DIR and DMI able to extinguish. E. Door manifold/actuator faulty Unlikely No air leakage from both actuator and manifold during open/close position. F. Residue voltage in Electromagnetic Valve Unlikely Measured 105VDC across magnet valve during door opening. No residue voltage when door commanded to close. 4. Rectification details Replaced all 3501 A3 door rollers Cleaned J-rail of dirt and debris on 3501 A1 door Function check, door operation - satis Do 10/20mm gauge test - Passed Door cyclic test 20◊ - ok Door open/close timings - ok Check manifold and actuator for any air leak - No leaks found Check EMV for any residue voltage when door close - ok Door manual force check - ok DONE BY:IDRIS/SANKAR/AZLI/FAIZAL 08.10.2023