As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3519 THE CREW REPORTED A E2 FIRE DETECT FAIL IN CRUISE. THE CREW ELECTED TO RETURN. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED NR 2 ENGINE FIRE DETECTOR ASSEMBLY IAW EMB 145 AMM 26-11-01. PERFORMED AN OPERATIONAL CHECK IAW 26-10-00 AND SYSTEM WORKS GOOD. NO DEFECTS FOUND. THE AIRCRAFT WAS RETURNED TO SERVICE.