As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - FLT 217 - EN ROUTE ORD-OGG, THREE HOURS INTO FLIGHT, RECEIVED LEADING EDGE SLAT ASYMMETRY EICAS CAUTION AND STANDBY BUS OFF CONDTIONS. DC STANDBY CIRCUIT BREAKER POPPED. EMERGENCY DECLARED AND LANDED AT LAX WITHOUT FURTHER INCIDENT. REPLACED DC STANDBY CIRCUIT BREAKER AND K109 RELAY. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)