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 STARNDARD EMERGENCY PROCEDURES AND RETURNED WITHOUT FURTHER INCIDENT. ONCE BACK IN MAINTENANCE FOUND THE FIRELOOP ELEMENT TOUCHING THE COWLING GIVING A FALSE FIRE INDICATION.