As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT AT 4500 FEET FLIGHT CREW HAD A NR 1 ENGINE FIRE MESSAGE. CREW FOLLOWED QRH PROCEDURES SHUT DOWN ENGINE AND FIRE INDICATION MESSAGE EXTINGUISHED RETURNED TO THE FIELD WITHOUT INCIDENT. EMERGENCY WAS NOT DECLARED. UPON FURTHER INVESTIGATION FOUND COUPLING CLAMP NOT INSTALLED PROPERLY.