Passenger feedback Staff(MSL) car 2616,one of the train doors did not open. Staff (YWT) checked andconfirmed Rear M2 car, "A1" door unable to open. ~~~~~ Passenger feedback Staff(MSL) car 2616,     #2616-A1 door no fault code during the time reported.Door mating-65.1,DCS to plate 15.1 push/pull forcve-tight to open>10kg.DLD rubber cushion ok.DLS red mark visible-not visible.Check guide rail & J-rail no FOD found.Further check found left & right door wobbly.Removed door and found both side main roller damage.Replaced roller and re-take push/pull-5.5kg,door mat-63.5 and DLS red mark adjusted to visible-ok.Door static open/close ok.Door cyclic test few times ok. Done by Zulq/Haslan. 09/06/22