TIMS showed intermittent BCU fault at car rear M1 approaching KRJ2. Fault self cleared at KRJ2. Trai n performance - ok. ~~~~~ #1628 Found ACU air leak at solenoid exhaust port. Replaced ACU and brake cyclic test-fail on BCP at B1, B2, B3. Replaced ACU control pressure Transmitter. Brake cyclic test, BCP within criteria and no sign of ACU leak. ACU - Old s/n: 1429-012  New s/n: 1429-010. Not: 2140963 raised to RSW. Done by Zulqarnain/Koh. 13/03/20.