As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NUMBER 3 ENGINE FIRE WARNING LIGHT ILLUMINATED AND HORN SOUNDED. PERFORMED ENGINE FIRE/FAILURE CHECKLIST, DECLARED EMERGENCY, DUMPED FUEL TO LANDING WEIGHT AND LANDED. FOUND FRAYED WIRE AT PIN-X OF D400P, REPINNED WIRE AND OPS CHECKS GOOD.