As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CRUISE FLIGHT, ONE POST LIGHT CONNECTOR BURNT. IT APPEARED THAT THE CONNECTOR SPRING BROKE AND CAUSED AN ARC, OVERHEATING THE CONNECTOR AND CAUSING SMOKE IN THE COCKPIT. THE LIGHTING SYSTEM WAS DEACTIVATED AND THE AIRCRAFT RETURNED TO BASE.