Pax to staff(NOV) that Rear M2 car 'A1'3606/ door did not open at BSH and BDL SB. SM(CTH) checked and con firmed train door did not open at at CTH SB. SM(CTH) isolate d the faulty train door at MSP NB. SM(MRB) helped to paste t ~~~~~ Pax to staff(NOV) that Rear M2 car 'A1'     #2606-A1 LHS door roller damage,c/o ok. Found #2606-A4 door LHS door wobbling and rubbing sound due to outer roller damage,c/o done.Mating strip,push/pull,DLS red line,DSS,Door function and static test ok. Done by Koh/Sanip.  19/04/23