As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE FIRE NR 3 AT FL 280, FIRE EXTINGUISHED. POST FLIGHT NR 3 ENGINE, NO FIRE DAMAGE DETECTED CONTRARY TO COCKPIT WARNING PROCEDURES. DETERMINED FIRE WARNING CAUSED BY LEAK AT PNEUMATIC DUCT ATTACHING CLAMP. REMOVED AND REPLACED CLAMP AND DID ENGINE RUN AT POWER. SYSTEM OPS CHECKED GOOD. (M)