TIMS showed BCU fault at car 2669. Fault self cleared.Fault Occur again at SOM SB ~~~~~ Downloaded ER and fault trace on PTU006. From Tims observed #2669 multiple FC: 308,312,314,330,331. Carried out brakes cyclic check and observed #2669 BCP stuck at 2.8 bar when at coast position. Further observed ACU heavy leaking from solenoid coarse exhaust. Replaced ACU and carried out brakes cyclic/function test ok. Checked #2669 brake shoes, thickness within criteria ok. Checked wheel condition ok. No wheel flat found. Checked axle gearbox temperature stickers ok. Done by Jack/Joshua   20/05/21.