As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 310 ENGINE NR 3 LOOP (B) LIGHT ILLUMINATED, AFTER NOTIFING THE CAPT THE LOOP (A) LIGHT CAME ON WITH ENGINE FIRE WARNING. EMERGENCY AND IRREGULAR PROCEDURES ACCOMPLISHED, GROSS WEIGHT ADJUSTED AND RETURN TO AIRPORT. NO FURTHER PROPLEMS NOTED.