As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COCKPIT SYSTEMS DID NOT OPERATE ON EMERGENCY BATTERY. EMERGENCY BATTERY SWITCH, COCKPIT OVERHEAD, FOUND DEFECTIVE. REPLACED EMERGENCY BATTERY SWITCH AND FUNCTIONALLY CHECKED EMERGENCY BATTERY SYSTEM IAW MM. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE.