As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW DISCOVERED THAT THE AFT CARGO LIGHT WAS INOPERATIVE. MAINTENANCE DISCOVERED WHILE TROUBLESHOOTING THE LIGHTING SYSTEM, THAT THE LIGHT WIRING WAS IN CONTACT WITH THE APU INLET HOUSING, THIS CONDITION LED TO THE WIRES CHAFING THROUGH. THE WIRING FOR THE LIGHT WAS REPAIRED AND PROTECTED FROM FURTHER DAMAGE.