1634 Train prep found BCU fault. ~~~~~ #1634 Found BCP 3.05bar at coasting.FC-308,331,330 & 314 (Air leak at exhaust port) Replaced ACU and function test BCP ok. Not: 2253399 raise to RSW. ACU-New s/n: 1539-179  Old s/n: 516-105 Done by Sanip/Faddzal/Deeshan. 03/03/21