TC reported front M1 car A1 train door not proven closed. TC recycle few times for train to depart. Fault recurred at WDL NB, TC recycle once for train to depar t. Staff (WDL) monitor for 3 stations and feedback no abnorm ~~~~~ 1643 TC reported A1 train door not proven closed. TC recycle few times for train to depart. Fault recurred at WDL NB, TC recycle once for train to depart. Staff (WDL) monitor for 3 stations and feedback no abnormalities on the train doors. Train scheduled UPD withdrawal.  1643 A1 door checked guide rail,roller guide & weather strip for FOD - OK. Found RHS door rollers delaminated - replaced both rollers. Function check door operation - OK. Replaced LHS door rollers. Security/function check door operation - OK. Door static test - OK.  Ahmad/Fandi/Syairazi/Syukur/Suhairi/Aliff/Daniel/Redzwan 45356