As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MULTIPLE EICAS MESSAGE WITH STANDBY POWER AUTO DURING DESCENT FL290. EMERGENCY DECLARED TO KCVG. AIRCRAFT LANDED WITHOUT INCIDENT NO OTHER PRECAUTIONARY ACTIONS TAKEN. AIRCRAFT WAS GROUNDED FOR INSPECTION AND MAINTENANCE. LINE MAINTENANCE REMOVED AND REPLACED MAIN BATTERY TRANSFER RELAY IN ACCORDANCE WITH BOEING 767 AIRCRAFT MAINTENANCE MANUAL 24-33-02. OPERATIONAL CHECK GOOD. AIRCRAFT WAS RELEASED FOR SERVICE.