TIMS showed BCU brake release fault at front M2 car. Brake status at TAP2 -ok. ~~~~~ 2150811 Checked 2663, found when 750VDC cut off, B1 to Coast, air leak from solenoid coarse exhaust. Replaced ACU. Function test brake, no leak found, brake pressure ok. Old:1538-165. New:1516-108. Sufhian,Alauddin,14.4.20.