TC reported front M1 car 'B3' side 'train door not proven closed. TC opened and closed a few times t o clear the fault. ~~~~~ TC reported front M1 car 'B3' side 'trai     #1509-B3 ddor found Left & right door roller damage.No FOD found on guide rail.Replaced both roller and door function tested ok. Done by Haslan/Asruddin/Saini/Zulq.  28/04/22