TC reported TIMS showed obstacle detected at front M2 car 'A1' door. Fault self-cleared and did not recur at subsequent stations. Staff(SBW) checked and confirm ed front M2 car 'A1' door opened and closed normally. ~~~~~ TC reported TIMS showed obstacle detected     Checked found FC019 (A1 Encoder Fault: ET). Replaced door operator. Cx door mating strip gap, DLS, DCS, door gauge and function tested satis S/N: 1412W020021S037 (O) D18YF008S004 (N) Notification to CSC: 2509167 Done by Jack, Rizman, Koh. 25/7/2023 (N)