Train encounter BCU fault at Front M1 car when train was braking. Fault self cleared. when train dep arted. ~~~~~ 1528 encounter BCU fault when braking. Fault self cleared when train departed.  1528 FC BCU BCP bogie 1 & 2 fault. ER no BCP abnormalities during time of fault. Brake cyclic test & BCP within criteria. Swapped BCU from #2528 to #1528. Installed new BCU on #2528. Measured #1528 BCU pins - OK. Wheel diameter updated.  Lee JC 44972 After Rectification : #2528 BCU S/N : 1809045 #1528 BCU S/N : 1825084 (from #2528)                 1809054 (Old, faulty)