As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGA/ORF - FLT 1703 - AFTER TAKEOFF, THE MASTER CAUTION LIGHT AND THE RIGHT ENGINE 'B' FIRE LOOP LIGHT ILLUMINATED WITH AN INTERMITTENT RIGHT ENGINE FIRE LIGHT. THERE WAS NO ENGINE FIRE BELL. THE RIGHT ENGINE WAS SHUT DOWN AND THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. SEVEN MINUTES SINGLE ENGINE TIME. MAINTENANCE REPLACED THE RIGHT ENGINE FIRE DETECTOR CONTROL UNIT. (X)