What was found
LAX/TPE - RIGHT EMER AC BUS'' OFF MESSAGE DURING FLIGHT. DIVERTED TO CTS WITH LIMITED INSTRUMENT. ''REAC SENS RELAY/INTFC'' CURRENT FAULT FOUND ON CFDS, BUT PERFORM EPU R-T-S TEST PASS AND CHECK ALL FUNCTIONAL NORMAL. FOR MAINTENANCE PREVENTION, REPLACED RCCB B1-138 IAW MM 24-25-0, AND PERFORM OPERATIONAL TEST, FUNCTION NORMAL. (X)