Staff (ADM) feedback off duty staff reported Rear DT car B2 door was not opened. Staff (MSL) observe d for 3 subsequent stations, Rear DT car B2 door did not ope n at KRJ NB, however, train door opened normally at YWT NB a ~~~~~ 3644 Staff (ADM) feedback off duty staff reported Rear DT(3643) car B2 door was not opened. Staff (MSL) observed for 3 subsequent stations, Rear DT(3643) car B2 door did not open at KRJ NB, however, train door opened normally at YWT NB and MSL NB.  3643 check no fault code. 3643 B2 door fault able to duplicate unable to open. Found RHS door roller delaminatd. Replace LHS/RHS Dooor roller with Iron roller. Check guide rail, Jrail ok. DLD, DLS, DCS pl. No sign of FOD, Door cyclic and static test ok. Matting within criteria. Side finding 3643 B3 door wobbly.Found RHS door roller delaminatd. Replace LHS/RHS Dooor roller with Iron roller. Check guide rail, Jrail ok. DLD, DLS, DCS pl. No sign of FOD, Door cyclic and static test ok. Matting within criteria. Done by Haslan/Zulq/Asruddin/Saini 45320