What was found
LEFT ENGINE FIRE WARNING. EMERGENCY DECLARED RETURNED LAS WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED NR 1 ENGINE UPPER RT ANTI-ICE DUCT. SYSTEM GROUND CHECK NORMAL OPERATION.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
LEFT ENGINE FIRE WARNING. EMERGENCY DECLARED RETURNED LAS WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED NR 1 ENGINE UPPER RT ANTI-ICE DUCT. SYSTEM GROUND CHECK NORMAL OPERATION.