Train doors at Rear M2 car not proven closed. TC opened and closed once to clear fault. Fault did no t recur at the next station. Staff(GCL) checked and confirme d all train doors -ok. ~~~~~ 2507 Train doors not proven closed. TC opened and closed once to clear fault. Fault did not recur at the next station. Staff(GCL) checked and confirmed all train doors - ok.  2507 No FC. Checked 2507 found B1 heavy vibration & other doors gauge,door rollers all - OK. 2507 B1 L/H/S both roller pitted & R/H/S outer roller pitted. Replaced all damaged rolers . No FOD found.Cleaned J-Rail & guide rail, weather strip - OK. Door guage 10/20mm checked - OK. Door cyclic checked - OK. No DIR Lited. All doors proven closed. Sarma/Sugu/Alan/Lee PT,Kamarul 45255