As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED APU FIRE WARNING ILLUMINATED IN FLIGHT FROM PHX TO DEN. THE APU FIRE BOTTLE WAS DISCHARGED AND AN EMERGENCY WAS DECLARED. THE AIRCRAFT WAS DIVERTED TO ABQ AND LANDED WITHOUT INCIDENT.AN INSPECTION REVEALED NO SIGNS OF OVERHEATING OR FIRE. PLACARDED APU FIRE DETECTION SYSTEM PER MEL 26-8.1. SUPPLEMENTAL INFORMATION TO FOLLOW WHEN REPAIR IS ACCOMPLISHED.