As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT, NR 3 FIRE WARNING WENT OFF. COMPLETED ALL APPROPRIATE CHECKLISTS, VISUALLY INSPECTED NR 3 ENGINE AND NO DEFECTS NOTED. FOUND INSULATOR NR 3 ENGINE FIRE LOOP OUT OF PLACE. REINSTALLED INSULATOR PER DACO DC-8 MM 26-10-1. NR 3 ENGINE FIRE WARNING TESTS GOOD PER DACO DC-8 MM 26-10-0.