As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED DUE TRIPLE CHIME WITH APU FIRE WARNING IN FLIGHT. FIRED NR 2 FIRE BOTTLE AND CAS CLEARED. AIRCRAFT LANDED WITHOUT INCIDENT. R&R NR 2 FIRE BOTTLE. OPS CHECK OF FIRE DETECT AND EXTINGUISHING SYSTEM GOOD. INSPECTED APU FOR SIGNS OF FIRE. NO DEFECTS NOTED. INSTALLED 3 DISCARGE CARTRIDGES. R&R APU EDUCTOR SENSING ELEMENTS.