Train doors at car 2509 were not provenclosed. TC recycled train doors a few times but to no avail.Staff(PYL) assisted to push close and isolate the defective 'B3' doors at car 2509 in close position. Fault didn't recu  ~~~~~ 2509 Train doors were not proven closed. L3 TC recycled train doors a few times but to no avail. Staff(PYL) assisted to push close and isolate 2509 B3 DOOR in close position. Fault didn't recurred at subsequent station. QUE WB L3 2509 From ER, TC cycled doors x3 times to clear fault. Faults recur at the 3rd stations. Station staff isolated SDIC. FOD found: N Weather strip condition ok: Y Push/pull door smooth, no wobble: N, 2509 B3 door LHS and RHS pitted Clean J rail and guide rail: Y 10/20mm gauge test pass: Y Manifold/Actuator leaking: N Door cyclic test 20x, DIR extinguish ok: Y, after rectification TIMS door static timing test pass: Y, after rectification Door magnetic valve no residual voltage when closed: Y Replaced #2509 B3 door LHS and RHS rollers.  Alan/Kamarul 45492