As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT AFTER TAKEOFF, THEY RECEIVED AN ENG 1 FIRE DETECTION FAIL MSG. THE CREW DIVERTED THE ACFT & LANDED WITHOUT FURTHER INCIDENT. REPLACED THE ENG 1 PYLON FIRE LOOP. OPERATIONAL CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED.