Train doors at Rear M2 car B3 doorwerenot proven closed. TC recycled train doors once - ok. Fault did not recur at subsequent stations. Staff (ORC) checked a nd confirmed no abnormalities. ~~~~~ Train doors at Rear M2 car B3 door  were Check Tims no observe B3 having door fault FC.Further check no FOD found.Door roller check ok.Mating strip ok.Push/pull LHS-6.8kg.RHS-9.32kg. After clean 6.2kg~6. 5kg.DLS,DCS check ok.Tims observed B2 done.FC-593-CLE happen once.Further check no FOD found,roller check ok.Mating strip check ok.Push/pull 6.2~6.3kg,DLS and DCS check ok.Door cyclic & static test ok.#2627-B3 door DLS adjusted and test ok. Done by Koh/Jack. 27/3/22