TC reported TIMS showed obstacle detected at Front M1 A2 doorwhen train door opened only. Fault re curred at all stations. Staff(WDL) checked and confirmed Fro nt M1 A2 doordid not open fully. Staff feedback safe for p ~~~~~ Check Tims no observed any fault code. Remove RHS door and found 1 big & 1 small rollers give way to the bearing. Replaced rollers. Clean J-rail & guide rail. Push/pull resistance 5.8kg, door mating strip within criteria. DLS out - adjusted ok. DSS check ok. Conduct door static test ok. Door cyclic 50x checked ok. Done by Deeshan/Sanip/Faddzal. 10/01/21.