As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF AT FLIGHT LEVEL 220, THE CREW OBSERVED A FIRE INDICATION LIGHT ON THE NR 1 ENGINE. THE FLIGHT CREW FOLLOWED STANDARD EMERGENCY PROCEDURES AND RETURNED TO DEPARTURE WITHOUT FURTHER INCIDENT. ONCE BACK, MAINTENANCE FOUND THE FIRE LOOP ELEMENT TOUCHING THE COWLING GIVING A FALSE FIRE INDICATION. (K)