As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF, EXPERIENCED AN ENGINE FIRE WARNING BELL WITH NO CAUTION LIGHT, WARNING LIGHT OR OTHER SECONDARY INDICATIONS. MADE THE DECISION TO ABORT FLIGHT AND PERFORM A PRECAUTIONARY LANDING BACK AT DEPARTURE. LANDED WITHOUT INCIDENT. NO INDICATION OF ACTUAL FIRE. SUSPECT FAULTY FIRE DETECTION SYS. TROUBLESHOOTING INDICATED A FAULTY TEST ON THE NR 2 SYS. FIRE WARNING LIGHT WOULD ILLUMINATE BUT THE AUDIO WAS ABSENT. REPLACED FAULTY INBD RT ENGINE COMPARTMENT FIRE DETECTOR.