TC reported TIMS showed BCU fault at front DT car. Fault code 322. TC feedback train performance nor mal. ~~~~~ #3566 FC-322 multiple times and BCU fault cause BCP stuck at 2.6 bar. Replaced BCU, wheel diameter set ok. Brake cyclic test ok and BCP within criteria. During DT check found #3565 Tims shown BCP 1 & 2 slow release. Found ACU slow release and air leaking from exhaust port. Replaced ACU and function test ok and BCP within criteria. #3566-BCU-Old s/n: 1826096. New s/n: 1823184. Not: 2268532 raised. #3565-ACU-Old s/n: 1034-012. New s/n: 1012-014. Not: 2268530 raised. Done by Sanip/Faddzal/Deeshan. 20/04/21.