As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STL - FLT 19 - EN ROUTE JFK-LAX, DURING CRUISE DETECTED LEFT ENGINE FIRE LOOP 1 AND 2 ILLUMINATE. DIVERTED STL AND LANDED WITHOUT FURTHER INCIDENT. REPLACED LEFT SIDE UPPER FIRE LOOP ASSEMBLY. ACCOMPLISHED FIRE LOOP OPERATIONAL CHECKS PER THE MM. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)