As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJC CREW REPORTED EMERGENCY AC BUSS RELAY CIRCUIT BREAKER K7 POPPED IN FLIGHT. EMERGENCY DECLARED FLIGHT RETURNED SJC LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED BATTERY CHARGER & BOTH SHIPS BATTERIES. SYSTEM GND CHECKED NORMAL OPERATION CLOSED.