As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU SHUT DOWN WITHOUT WARNING. ATTEMPTED RESTART. GROUND PERSONNEL ADVISED FLAMES PRESENT. DISCHARGED APU BOTTLE. INSPECTED APU COMPARTMENT AND AIRFRAME, NO FIRE DAMAGE NOTED. APU FIRE BOTTLE DISCHARGED. REPLACED APU WITH A SERVICEABLE UNIT IAW 49-10-00. OPERATIONAL CHECK GOOD.