TC reported intermittent BCU fault at Rear M2 car. Fault self cleared. ~~~~~ 2659 FC 308/312/314/330 & 331. ER Shows 2659 brake did not release. Faulty ACU replaced. Tested brake operation - OK. Air leak check - OK. Old: 1511/086. New: 1403/008. Wong ANand/Aqil/Shamil. 05/07/22.