Staff (AMK) reported train doors at car2664 B3 were slow in opening. Staff (AMK) follow train and f ault did not recurred at subsequent stations. ~~~~~ 2664 Staff (AMK) reported B3 train doors were slow in opening. Staff (AMK) follow train and fault did not recurred at subsequent stations.  2664 B3 door No FC found. Function test & found door intermittently unable to open fully. FOD found: N Weather strip condition ok: Y Roller condition ok: Y Clean J-rail & guide rail: Y 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: Y Door close switch actuating plate distance ok: Y Swapped door operator to #2664 A3 door and found fault transferred. C/O door operator at A3 door. Door operator s/n: New: 1601W020021S002 Old: 1410W020021S039  Kamarul/Anand/Lee PT/Shafie 45483