Train doors at Front M1 car were not proven closed. TC recycled train doors once - ok. ~~~~~ 1533 A2 door vibrating. Found all roller pitted. To replace.  1533 A2 door checked/found both LHS & RHS outer & inner door rollers pitted. Replaced all the pitted rollers. Security/function check - OK. Door cyclic test & no DIR lighted up when doors were closed.  Sarma/Sugu/Lee PT 45201 1533 Train doors were not proven closed. TC recycled train doors once - ok. CE 1533 all doors proven closed n no DIR lit. Depot 1533 train door operational check.  1533 Download ER, A-side confirmed: DIR not energised during time of fault. A/S cycled. TC cycled once to clear fault. FOD found: N Weather strip & roller condition ok: Weather strips ok.                                All rollers ok except #1533 A2 door. Clean J-rail & guide rail: Y 10/20mm gauge test pass: Y Manifold & actuator leaking: N Door cyclic test 20x, DIR extinguish ok: Y TIMS door static timing test pass: Y Door magnet valve no residue voltage when closed: N OPS 20 raised to replaced #1533 A2 door rollers.  Lee JC 45201