As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB AT FL120, NR 3 ENGINE FIRE WARNING LIGHT ILLUMINATED AND ASSOCIATED WARNING HORN SOUNDED INTERMITTENTLY. CREW FOLLOWED ENGINE FIRE EMERGENCY CHECKLIST SECURED ENGINE AND FIRE EXTINGUISHER BOTTLES WERE ACTIVATED. ENGINE FIRE INDICATION REMAINED, CREW DECLARED AN EMERGENCY RETURNING TO DEPARTURE STATION YWG.