As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOWER AFT BODY OVERHEAT LIGHT CAME ON IN FLIGHT FL370. DESCENDED DOWN TO FL 250 AND LIGHT WENT OUT APPROX 310 DURING THE DESCENT. *S/D* REPOSITIONED KEEL BEAM DETECTOR, REMOVED AND INSPECTED DUCT THAT RUNS THROUGH KEEL BEAM AND LEAK CHECKED. NO DEFECT NOTED.