Train doors at rear DT car not proven closed. TC recycle 3 times for train doors to proven closed. F ault recurred at TAM EB. Staff(TAM) assisted to isolate rearDT B-4 door at PSR EB. Train doors at rear DT car not prove  ~~~~~ CHECKED FOUND 3603 B4 RHS DOOR ROLLER FAULTY.C/O ROLLERS DONE,FIX BACK DOOR.SECURITY/FUNCTION CHECKED OK.PERFORM DOOR CYCLIC TEST A FEW TIMES DOOR OPEN/CLOSSE SMOOTHLY.DOOR TIMING AND 10/20MM OK.YUSRI/ZOHRI 17.02.2023