TIMS showed Obstacle Detector fault at Rear M2 car, 'B3' door when train doors were opened.Fault w as self cleared.Fault did not recurred at subsequent stati ons. ~~~~~ TIMS showed Obstacle Detector fault at R     FC-976, push/pull resistance >2kg and door once open,unable to close back.Further check found FOD was stuck atRhs door rail.FOD removed and door able to open/close.Rhs door observe was wobbling-remove RHS door found main roller having bearing knocking sound,c/o both door main roller and function test ok.Mating strip,push/pull,DSS,DLS check all ok.Door static and function test ok. Done by Sanip/Koh/Rizman.  26/03/23