As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PREFLIGHT CHECKLIST, CREW FOUND RIGHT REAR EMERGENCY OVERWING LIGHT INOP IN EMERGENCY MODE ON TEST. FOUND CANNON PLUG DISCONNECTED ON ASSOCIATED BATTERY PACK. RECONNECTED CANNON PLUG, LIGHT TESTS GOOD IN EMERGENCY MODE ON CHECK OUT.