As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE LIGHT CAME ON IN FLIGHT. FIRE HANDLE PULLED AND FIRE BOTTLE DISCHARGED. LIGHT WENT OUT AFTER 10 MINUTES. FOUND AN APU BLEED AIR DUCT WITH LOOSE CLAMP THAT WAS BLOWING ON THE FIRE DETECTION LOOP. TIGHTENED CLAMP, OPS CHECKS NORMAL.