What was found
ELEC BUS ISLN R EICAS ADVISORY RIGHT BUS TIE ISOLATION SWITCH OFF OR FAULT PREVENTING NORMAL BUS TIE OPERATION HAS OCCURRED. UNIT, GENERATOR OFF 27-2421-9-0001 0168 ON 27-2421-9-0001 0110 UNIT, REMOVED AND REPLACED APU GCU PER AMM 24-22-02. REPLACEMENT TEST GOOD. SOFTWARE CHECK IS GOOD. REF 777-FTD-24-01023. LOOK L/P 6034986 FOR MORE INFO. REMOVED AND REPLACED BPCU PER AMM TASK 24-41-05-400-801. REPLACEMENT TEST GOOD. SOFTWARE CHECK GOOD.REF 777-FTP-24-01023.