TC reported TIMS showed obstacle detected at car 3628 'A1 & B3' and 2627 'A2' door. Fault self-clear ed and did not recur at subsequent stations. Staff(YWT) chec ked and confirmed no abnormalities with all the train doors. ~~~~~ 3628 A1 & B3 & 2627 A2 door TC reported TIMS showed obstacle detected. Fault self-cleared and did not recur at subsequent stations. Staff(YWT) checked and confirmed no abnormalities with all the train doors. CE checked : T418(627/628) check no "obstacle detected " on car door 3628(A1), 2627 n Rm2 car 2627(A2)(B3) doors.. All doors ops found ok.  3628 A1 door Check fault code: No FC recorded FOD found: N Weather strip condition ok: Y Checked roller condition ok: Y Clean J-rail & guide rail: Y Push/pull door smooth & no wobble: Y Door cyclic test 20x, DIR extinguish ok: Y TIMS door static timing test pass: Y Door lock switch red line flush with surface for positive latching: Y Door close switch actuating plate distance ok: Y Rectification action: Swapped DCP from #3628 A1 to #3628 B1. Function test door operation - OK. S/n after swap: #3628 A1 1502W020011S047 #3628 B1 1608W020021S002 #3628 B3, #2627 A2 & B3 door Check fault code: No FC recorded FOD found: N Weather strip condition ok: Y Checked roller condition ok: N, #3628 B3, #2627 A2 & B3 door rollers pitted 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 Rectification action: Replaced #3628 B3, #2627 A2 & B3 door rollers to iron rollers. Function test door operation - OK.  Sarma/Sugu/Kamarul/Anand/Shafie 45320