TC reported Front DT car A1 door had abnormal sound when train door was closing. Staff(WDL) checked and confirmed no abnormalities. TC reported Front DT car A1 door had abnormal sound when train door was closing. Staff(W ~~~~~ 3660 TC reported A1 door had abnormal sound when closing train door. Staff(WDL) checked and confirmed no abnormalities.  3660 A1 door performed the following checks : FOD found: N Weather strip condition ok: Y Checked roller condition ok: N, A1 LHS 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 Door gap (criteria 63mm+1.5mm): 63.4mm Replaced all #3660 A1 rollers with iron rollers.  Daniel/Redzwan 45454