EB applied due to Rear M2 car BCU fault.TC reset EB and proceeded in ATPM mode to next station. Fau lt self cleared in ATPM mode. Train proceed in Auto mode sub sequently. ~~~~~ Confirmed in ER #2533 BCP stuck at 3.13 bar when all other car brakes were released.CBTC applied EB due to obstructed motion,fault cleared after EB reset.Replace ACU on #2533 due to brake slow release in EM to coast(750v off) Air leak and brake test-ok.Limited movement ok.ER downloaded in PTU 006. ACU-New s/n: 1912-157  Old s/n: 1042-067 Done by Saini/Koh. 21/02/21