As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAF-DIVERTED FLIGHT- BOTH MAIN DECK CARGO DOOR LIGHTS CAME ON DURING FLIGHT AT FL 330. THE CREW FOLLOWED QRH PROCEDURES AND LANDED AT MAF. TROUBLESHOOTING REVEALED THE PUSH TO TEST SWITCH WAS FAULTY (INTERMITTANTLY STICKING). THE AIRCRAFT WAS MAINTENANCE FERRIED TO PHX UNPRESSURIZED. IN PHX THE SWITCH WAS REPLACED AND FUNCTIONAL CHECKS GOOD. NO FURTHER PROBLEMS REPORTED.