Train doors at Front M1 car were not proven closed. TC recycled train doors once - ok. Staff(NOV) ch ecked and confirmed no train doors abnormalities. Fault did not recur at subsequent stations. Train doors at Front M1 ca ~~~~~ 1667 Train doors were not proven closed. TC recycled train doors once - ok. Staff(NOV) confirmed no train doors abnormalities. Fault did not recur at subsequent stations.  1667 A3 door FC 063 (Door close operation time-out). Checked door operation, no wobble & no FOD detected. Resistance check - Satis. Checked/found door lock s/w red line did not flush with surface. Re-adjusted DLS red line to flush with surface. Swapped DCP from #1667 A3 door to #1667 A1 door. Security/function check - OK.  Au TK 45125 #1667 DCP S/N : (after swapped) A1 DCP - 1512W020011S031 A3 DCP - 1512W020011S023