Train doors at rear M2 car, 'A3' doors were not proven closed. TC recycled train doors once - ok. ~~~~~ #2508 - TO REPLACED PITTED ROLLERS.  2508 A3 door rollers found pitted & uneven. Replaced both LHS & RHS door leaf rollers. Cleaned J-rail. Security/function check - OK. Door cyclic test & door gauge test - OK. Door open/close timing check - OK.  Sarma/Sugu/Anand 44932 2508 A3 Train door were not proven closed. TC recycled train doors once - ok. CE: 2508 A3 door operation ok, proven closed. No DIR fault. Depot 2508 A3 train door operational check.  2508 ER D/L & found DIR not energised during fault.    TC cycled doors once to clear fault. Checked #2508 A3 door for any FOD, weather strip condition, J-rail/guide rail, 10mm/20mm door gauge test - OK. Push/pull door & found movement slightly hard. Checked/found door main rollers on LHS & RHS pitted. Door cyclic test & DIR able to extinguish. TIMS static test - OK. Door magnet v/v voltage - OK. OPS 20 raise to replace pitted door rollers.  Lee JC 44567