As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT AT APPROXIMATELY 13,000 FT, THE REAR BAY OVERHEAT ANNUNCIATOR ILLUMINATED. CREW RAN CHECKLIST AND REQUESTED TO RETURN TO DEPARTURE. NO BLEED LEAKS WERE DETECTED. WHEN THE SENSORS WERE BENCH CHECKED, THREE WERE FOUND DEFECTIVE. MX REPLACED TEMP SENSORS TO CORRECT THE ISSUE.