As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE WARNING CAME ON IN FLT WITH BELL AND MASTER CAUTION LIGHT ON. APU FIRE HANDLE PULLED AND FIRE BOTTLE IAW FHB 3.26.5. PLACED APU, APU FIRE WARNING ON APU AND APU FIRE BOTTLE ON DMI. APU INSPECTED IAW 49-31-00 PG 601. NO EVIDENCE OF FIRE FOUND. (OPEN).