TC reported TIMS displayed 'Obstacle Detected' at 'B3' door of rear M1 car when train doors were ope ning. Staff(MSL) confirmed there were abnormalities with theaforementioned door. ~~~~~ TC reported TIMS displayed 'Obstacle Det     Checked #1681-B3 door no FC.Found no signs of FOD on guide & J-rail.Do speed test ok.No rubbing marks present.Door push/pull ,Mating strip all within criteria.DLS red marks visible ok.DLS,DCS all o signs of door wobbling during manual operation.Postulate FOD resulted in door obstruction and FOD dislodged during TC door cycle.Both guide & J    rail cleaned.Push/pull test ok. Done by Johari.  25/01/23