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 INDICATION. CREW REDUCED A LEFT ENGINE POWER AND FIRE WARNING CEASED. AIRCRAFT RETURNED TO MSP AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE 13TH STAGE MANIFOLD ON THE LEFT ENGINE, OPERATIONAL CHECK OK.