As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 887 - EN ROUTE MCO TO LAS. WHILE IN CRUISE FLIGHT, WITH THE NUMBER TWO GENERATOR ON MEL, THE APU HAD AN AUTO-SHUTDOWN AND FAULT ILLUMINATION. THE EICAS MESSAGE "APU FAULT" DISPLAYED. WITH ONLY A SINGLE SOURCE OF ELECTRICAL GENERATION, THE FLIGHT DIVERTED TO DFW. NO EMERGENCY WAS DECLARED. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE APU OIL COOLER.