Train doors at rear M1 car were not proven closed. TC recycled train doors once - ok. Fault did not recur at subsequent stations. Train doors at rear M1 car wer e not proven closed. TC recycled train doors once - ok. Faul ~~~~~ 1643 Train doors were not proven closed. TC recycled train doors once - ok. Fault did not recur at subsequent stations.  1643 A3 door performed the following check : Fault code: NIL FOD found: N Weather strip condition ok: Y Checked roller condition ok: N, 1643 A3 RHS outer roller delam Clean J-rail & guide rail: Y Push/pull door smooth & no wobble: Y, after rectification Door cyclic test 20x, DIR extinguish ok: Y, after rectification TIMS door static timing test pass: Y, after rectification Door lock switch red line flush with surface for positive latching: Y Door close switch actuating plate distance ok: Y Door gap (criteria 63mm+1.5mm): 63.7mm Replaced #1643 A3 all 4 rollers to Iron rollers.  Alan/Anand/Sugu 45293