As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DECLARED AN EMERGENCY DUE TO RED APU FIRE CAS IN FLIGHT. APU FIRE BOTTLE WAS DISCHARGED. LANDED WITHOUT INCIDENT. PRELIMINARY INSPECTIONS REPORTS THAT THERE WAS NO FIRE. REPLACED APU AFT FIRE DETECT LOOPS, RH FIRE BOTTLE, FIRE CONTROL UNIT, AND THE DISCHARGED SQUIB. OPS CHECK GOOD.