TC reported TIMS showed front DT car BCUfault. Fault self cleared after departing station. ~~~~~ TC reported TIMS showed front DT car BCU     #3651 Check and found ACU heavy air leak from solenoid v/v exhaust port.Replaced ACU and function check ok.Brake cyclic test are ok. ACU-Old s/n: 1517-050  New s/n: 1437-012 Not: 2128077 raise to RSW. Done by Koh/Jack/Kumar.  06/02/20