As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INDUCTION INTO THE HANGAR, MX FOUND THEY HAD NO CONTROL OF THE EXTERIOR EMERGENCY LIGHTS AS THEY WOULD NOT TURN OFF WITH SWITCH. MX DISCONNECTED AND THEN RECONNECTED THE CONNECTOR PLUG AT THE POWER SUPPLY AND THE LIGHTS RETURNED TO AN OPERATIONAL CONDITION.