As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE LEFT ENGINE EXPERIENCED A FIRE WARNING INDICAITON. CREW REDUCED LEFT ENGINE POWER SETTING AND FIRE WARNING CEASED. AIRCRAFT RETURNED TO LGA AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE 13TH STAGE MANIFOLD ON THE LEFT ENGINE, OPERATIONAL CHECK OK.