Train doors at Front M1 car were not proven closed. TC recycled train doors once - ok. Staff(AMK) fe edback that Front M1 'A4' door was abnormal when closing at AMK SB. Staff(TAP) boarded and confirmed door was vibrating ~~~~~ 3658 Train doors at Front M1(1658) car were not proven closed. TC recycled train doors once - ok. Staff(AMK) feedback that Front M1(1658) 'A4' door was abnormal when closing at AMK SB. Staff(TAP) boarded and confirmed door was vibrating when opening and closing. Staff(TAP)isolated Front M1 'A4' door in closed position. CTH SB L3 1658 A4 check and found LHS outer roller damaged, Replaced LHS/RHS roller with iron roller and function check ok, Door cyclic test/static test are ok. Done by Saini/Asruddin/Kumar 45376