TC feedback Front DT A4 door not provenclosed. TC open and close a few times but to no avail. Staff (KAL) isolated train door in closed position to clear fault. ~~~~~ Depot found car 3606 A4 door roller delaminated, causing high door resistance. Replaced door roller. Performed door function check - ok. Train released on 11/01/2021. Note: Faulty door roller sent to KHI.   3606 A4 DOOR CHEKC AND FOUND DOUINFG PUSH GAUGE FAIL 14KG FOUND LEFT DOOR  MOVEMENT IS FAIL CRITERIA 9 KG CHEKC AND FOUND MAIN ROLLER RUBBER DISLODGE AWAITING SPARE RELEASE HANDLE AND DOOR BREAKER AT 3606 A4 ISOLATED N.AFAIRUZ/11.01.21 ---------------------