As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MHR/LAX - FLT 2031 - DURING CRUISE, THE APU FIRE WARNING LIGHT ILLUMINATED. THE CREW PERFORMED ABNORMAL CHECK LIST AND DECLARED AN EMERGENCY AND RETURNED TO MHR. THE AIRCRAFT LANDED SAFELY WITHOUT ANY INCIDENT. VISUALLY INSPECTED APU AND SHROUD FOR EVIDENCE OF FIRE. NONE NOTED. ITEM TRANSFERRED TO DEFERRED MAINTENANCE ITEM MINIMUM EQUIPMENT LIST. THE AIRCRAFT WAS RELEASED BACK TO SERVICE. (X)