Train door at the rear M1 car was not proven closed. Open and closed a few time to no avail. Pax wer e disembarked. ~~~~~ Train door at the rear M1 car was not pr Check Tims observed EC-023(A1 door close operation time out:CLE) No FOD found,PTU event log and EP downloaded.Found door unable to fully close.Observed DLD dislodged and obstructed door closing.1 size mounting screw disloged and hanging,tighten back mounting screw to secure DLD ok.Further check found RHS door leaf alignment out,adjusted and function test ok.Door mounting strip check ok.Push/pull resistance ok.DLS,DSS check ok.Door cyclic and door static test ok. Done by Sanip/Koh. 09/02/22