As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL-ATL - FLT 637 - AFTER TAKEOFF, THE RIGHT ENGINE 'B' FIRE LOOP INDICATED FAILURE AND THE FIRE INDICATION LIGHT WOULD NOT EXTINGUISH. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE SECURED THE ELECTRICAL CONNECTOR AT THE RIGHT ENGINE FIRE DETECTOR AMPLIFIER. (M)