Train doors were not proven closed at front M2 car. TC opened and closed train doors once to clear f ault. Fault did not recur at subsequent stations. ~~~~~ 2517 Train doors were not proven closed. TC opened and closed train doors once to clear fault. Fault did not recur at subsequent stations. CE: 2517 door operations checked ok.  Found 2517 A4 Door heavy vibration. Found both LHS & RHS inner roller pitted - Replaced rollers. Cleaned J-Rail & guide rail. No FOD found. Weather strips -OK.Door cyclic checked - OK. Door guage 10/20mm -OK.Door closing /opening timimg - OK. No DIR lited & all doors proven closed. Sarma/Alan/Lee PT/Kamarul 45466