As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) LT ENGINE FIRE WARNING. THE ENGINE WAS SHUT DOWN AND THE FIRE EXTINGUISHER ACTIVATED. SUBSEQUENT INSPECTION COULD FIND NO EVIDENCE OF FIRE. PRELIMINARY INVESTIGATION SUGGESTS AN ENGINEANTI-ICE BLEED AIR LEAK. FURTHER INVESTIGATION FOUND THE NUT ON THE ENGINE ANTI-ICE BLEED AIR TUBE HAD COME LOOSE. SUSPECT DUE TO INSUFFICIENT TIGHTENING DURING MAINTENANCE. PERSONNEL/MAINTENANCE ERROR.