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. THE AIRCRAFT RETURNED TO BOS AND LANDED WITHOUT INCIDENT. MAINTENANCE DETERMINED PROBLEM TO BE INDICATION ONLY. THE RIGHT FIRE DETECT CONTROL BOX REMOVED AND REPLACED FOR TROUBLESHOOTING. MAINTENANCE PERFORMED OPERATIONAL CHECK OF FIRE DETECT SYSTEM. NO FAULT FOUND. SYSTEM OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. (X)