As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LIT - INFLIGHT DFW-IAD. CREW REPORTED LEFT ENGINE FIRE WARNING INDICATION. EMERGENCY DECLARED FLIGHT DIVERTED LIT LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. NO EVIDENCE OF FIRE WAS FOUND. REPLACED LOWER STARTER DUCT AT T-FITTING THAT WAS CRACKED. FOUND LOWER BURN THROUGH BARRIER LOOP ON LEFT ENGINE OPEN. REPLACED LOOP. SYSTEM GROUND CHECK NORMAL OPERATION.