TC reported TIMS showed obstacle detected at car 3615 'A4' door. Fault self-cleared and did not recu r at subsequent stations. Staff(WDL) checked and confirmed c ar 3615 'A4' door opened and closed normally. ~~~~~ 3615 TC reported TIMS showed obstacle detected at A4 door. Fault self-cleared and did not recur at subsequent stations. Staff(WDL) confirmed 3615 A4 door opened and closed normally.  3615 A4 performed the following checks :    Check fault code: No FC recorded FOD found: N Weather strip condition ok: Y Removed door checked roller condition ok: N, 1615 A4 LHS and 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 Rectification action: Replaced #1615 A4 door rollers to iron rollers. Swapped DCP from #3615 A4 door to #3615 B4 door for monitoring. DCP S/N : #3615 A4 door : 1412W020001S017 #3615 B4 dOOR : 1412W020001S027  Celine Tan 45306