As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE DETECTION WARNING LIGHT ILLUMINATED. CREW EXPENDED FIRE BOTTLE. LANDED AT HOU WITHOUT INCIDENT. INSPECTED AREA AND FOUND NO EVIDENCE OF FIRE OR OVERHEAT CONDITION. REPLACED FIRE BOTTLE AND CONTINUED PER MEL 26-7. DURING RON, REPLACED APU TAILPIPE FIRE LOOP PER BOEING M/M.