TC reported Front M1 car, 'B3' train door not proven closed. TC opened and closed train doors once t o clear fault. ~~~~~ 1526 TC reported Front B3 train door not proven closed. TC opened and closed train doors once to clear fault. CE : T232(3526) FM1 car 1526(B3) check door ops found ok. The door is proven fully closed.  3526 B3 door performed the following checks : FOD found: N Weather strip ok: Y Roller condition ok: N, 1526 B3 LHS inner roller pitted Clean J-rail & guide rail: Y 10/20mm gauge test pass: Y, after rectification Push/pull gauge test pass: Y, after rectification Manifold & actuator leaking: N Door cyclic test 20x, DIR extinguish ok: Y, after rectification TIMS door static timing test pass: Y, after rectification Door magnet valve no residue voltage when closed: Y    Replaced #1526 B3 LHS inner roller. Function test - OK.  Aliff/Daniel/Redzwan 45317