As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE FIRE DETECTION LIGHT FOR ENGINE NR 3 ON P6-3 PANEL OCCASIONALLY ILLUMINATES DURING CRUISE FLIGHT. LIGHT DEFERRED PER DHL MEL 26-9. PLACARD INSTALLED DMI 6791 CAT C. FOUND BROKEN INSULATION AND FIRE LOOP CONNECTOR CHAFING AGAINST BRACKET. PROVIDED CLEARANCE AND REPAIRED INSULATION. SYSTEM OPS CHECKED GOOD PER B-727 MM 26-11-0, CLEARING DMI 6791.