As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH . THE APU WAS STARTED. AFTER PASSING THE FAF WITH THE LANDING CHECKLIST COMPLETE, THE MASTER FIRE WARNING LIGHT AND FIRE BELL ACTIVATED. PILOT ANNOUNCED THE APU FIRE HANDLE WAS ILLUMINATED. PULLED THE FIRE HANDLE. A SHORT PAUSE AFTER THE HANDLE BEING PULLED, LIGHT IN THE HANDLE WAS STILL ILLUMINATED,