TC reported FDT car 'A1'train door slowed in opening.Staff(TNM) checked and confirmed no abnorma lity. ~~~~~ DURING DOOR OPERATION FOUND 3644 A1 DOOR ISOLATED,NORMALISED AND CHECK OPENING AND CLOSING OPERATION NOT SMOOTH.DOOR WAS ON NON PLATFORM SIDE.SUSPECT ROLLER OR BEARING ARE FAULTY.CHECK TIMS THAT THE SAME DOOR HAS FAULT CODE 022 OCCUR MULTIPLE TIMES ON 08/01/2023 ,09.01.2023,10.01.2023 ABLE TO SELF CLEAR WITHIN 25 TO 30 SEC.OPS20 TO C DOOR BEARING/ROLLER ON PLATFORM SIDE.ETHAN 11.01.2023  FOLLOW UP FROM OPS10 C/O 3644 A1 SALOON DOOR ROLLER BEARINGS.CONFIRM ROLLER WORN OUT FOR BOTH LHS/RHS.CLEAN J RAIL DONE OK.CHECK J RAIL NOT TILTED TO EITHER SIDE.SECURE CHECK/FUNCTION CHECK DONE OK.OPEN/CLOSE DOOR 20X TIMES DONE OK.SHAHRIE/TEH 11.01.2023