EB applied when train departed platformwith ATS High Alarm showed 'CBTC Applied EB due to Train Doo rs opened while moving, VOBC 1326'. Fault recurred when TC r eset EB for second time and switched to AM mode. TC reset EB ~~~~~ EB applied when train departed platform     ER downloaded to PTU 007.Confirmed DIR dropped for 1 sec at 19:53:06 and 20:24:07,train apply EB at 19:35:37 with no DIR drop in ER.No door related FC on Tims.All door open & close  timing ok.DIR ,DMI and Tims indication all ok.Checked cab door and detrainment door se ok.Further check found #3643-A4 door leaves able to be pushed slightly apart(with larger mating strip gap top 69mm and middle 70mm. but no DIR lit.Adjusted door leaf-top/middle/bottom 63mm/64mm/.Door secure checked DLS,DCS ok.DIR loop resistance satis.Power supply to DIR satis during depot shunting. To follow up with #3643 A4 door check.To check DIR,COR6 relay coil contacts. DIR loop line,COR6 and DIR relays were checked,continuity sati.Checked M2-M2 coupler pins and cleaned as preventive measure.Postulate that #3643-A4 door lock pin was not fully insert into hole to prevent sliding    movement of the door.Adjusted door mating strip ok. Done by Ting Wei  26/02/21