Train doors at Front M1 car were not proven closed. TC recycled train doors once - ok. Fault did notrecur at subsequent stations. ~~~~~ Train doors at Front M1 car were not pro     FC 063-A3 door close operation time out x1. Checked J-rail & guide rails no FOD.Checked and found DLS red line too protruded-adjusted ok.DLD rubber intact.DCS:15mm.Push/pull 6kgf.Door mating strip 63.8mm.Door cyclic ok.Static test ok. Done by Lincoln Koh.  27/07/22