As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - FLT 276 - AIRCRAFT EN ROUTE LAX-MIA WHEN AFT CARGO SMOKE DETECTOR INDICATED A FIRE. RETUNED IMMEDIATELY TO LAX FOR A LANDING WITHOUT INCIDENT. AIRCRAFT WAS OVERWEIGHT. PERFORMED OVERWEIGHT INSPECTION. REPLACED FAILED WARNING SYSTEM SENSOR IN THE AFT CARGO. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)