As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED FIRE LOOP "B" LIGHT ILLUMINATED ON CLIMBOUT. EMERGENCY DECLARED RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT ENGINE LOWER BARRIER LOOP ASSEMBLY. SYSTEM GROUND CHECKED NORMAL OPERATION.