As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) LEFT HAND ZONE 1 FIRE WARNING ILLUMINATED. ENGINE SECURED AND FIRE BOTTLES DISCHARGED. AIRCRAFT LANDED SAFELY. MAINTENANCE CHECK FOUND LEFT HAND EXHAUST PIPE UNIVERSAL COUPLING HAD SEPARATED ALLOWING EXHAUST GASES TO ENTER ENGINE NACELLE. COUPLING FAILED DUE TO WEAR OF FLANGE AND CLAMP BAND. COUPLING REPLACED.