As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE MAINTENANCE TEAM REPORTED THE CO-PILOT AVIONICS NOT TURNING OFF WITH MASTER SWITCH. THE MAINTENANCE TEAM TROUBLESHOT AND VERIFIED THAT THE COPILOTS EFIS RELAY WAS DEFECTIVE. THE RELAY WAS REMOVED AND REPLACED WITH A NEW RELAY. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.