As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LEVELING OFF, NR 2 ENGINE FIRE WARNING LIGHT ILLUMINATED WITH AURAL INDICATION. THEN WENT OUT. INDICATIONS RETURNED, AND WENT OUT AGAIN AND THIRD TIME STAYED ON. ENGINE SECURED AND EMERGENCY CHECKLIST FOLLOWED AND RETURNED TO DEPARTURE. INSPECTED WIRING FOR NR 2 FIRE DETECTION SYS AND NO FAULTS FOUND. REPLACED THE NR 2 ENGINE OTBD FLAME DETECTOR AND THE NR 2 ENGINE INBD FLAME DETECTOR.