As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER 30 MINUTES OF TAKE OFF DURING CLIMB FIRE WARNING ON ENGINE NR 3, REDUCED POWER AND WARNING SOUND AND LIGHT OFF. IAW OPERATIONAL PROCEDURES, AIRCRAFT RETURN TO DEPARTURE POINT. LINE MAINT. FOUND UPPER LOOP SENSOR CHAFING WITH PYLON. CORRECTIVE ACTION: REPOSITIONED LOOP AND ACCOMPLISHED ENGINE RUN UP IAW AMM 71-00-00 AND TAFI 26-11-00