As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE WIRES ON THE EXTERIOR LIGHT ARE SOLDERED INTO THE LIGHT BULB SOCKET. THE LIGHT BULB GENERATES ENOUGH HEAT WHILE ILLUMINATED TO CAUSE THE SOLDER TO MELT AND THE WIRE TO COME LOOSE CAUSING THE LIGHT BULB TO EXTINGUISH. THIS IS AN ONGOING PROBLEM.