As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3530 THE CREW REPORTED THAT UPON TURNING BATTERIES TO AUTO AND POWERING AIRCRAFT, THE CABIN AND EMERGENCY LIGHTS ILLUMINATED ON ICU AND UNABLE TO COMMUNICATE WITH CABIN VIA INTERPHONE. THE AIRCRAFT WAS REMOVED FROM SERVICE. RESET ELECTRICAL SYSTEMS REF AMM 24-31-00. NO PARTS REMOVED OR REPLACED. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.