As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2537 - EWR - FLIGHT CREW REPORTED ENGINE NR 1 FIRE DETECT FAIL CAUTION MESSAGE APPEARED TWICE IN FLIGHT ON EICAS. EWR MX REMOVED AND REPLACED ENGINE NR 1 FIRE LOOP AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.