As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT AN AC ESS BUS ANNUNCIATOR ILLUMINATED IN FLIGHT. THE MAINTENANCE BASE TROUBLESHOT AND DETERMINED THE K1XD SENSE RELAY WAS DEFECTIVE. THE DEFECTIVE RELAY WAS REMOVED AND A NEW UNIT INSTALLED. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.