As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NUMBER 4 ENGINE FIRE WARNING ACTUATE DURING DESCEND PROCEED AS ENGINE FIRE CHECKLIST. INSPECTED AFT AND FWD COWLINGS FIRELOOPS AND WIRE HARNESS, FOUND LOOSE CONNECTORS. TIGHTENED AND SAFETIED. RUN ENGINE IN 90 PERCENT AND TAKEOFF POWER 10 SEC, EACH ONE AND FIRE WARNING SYSTEM OK.