As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) AFT BAGGAGE COMPARTMENT SMOKE DETECTOR ILLUMINATED. FIRE EXTINGUISHER DISCHARGED INTO COMPARTMENT. NO EVIDENCE OF FIRE. FURTHER INVESTIGATION FOUND THAT THE REAR BAGGAGE COMPARTMENT NR 2 SMOKE DETECTOR WAS OUT OF CALIBRATION RESULTING IN OVERSENSITIVE OPERATION.