As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 4304 - AFTER DEPARTURE, RIGHT ENGINE FIRE WARNING CAME ON INTERMITTENTLY. AIRCRAFT RETURNED TO BOS AND LANDED WITHOUT INCIDENT. MAINTENANCE VERIFIED THE PROBLEM WAS ONLY INDICATION. MAINTENANCE REMOVED AND REPLACED RIGHT ENGINE FIRE LOOP. SYSTEM OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. (X)