As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: L WING BODY OVERHEAT LIGHT CAME ON DURING CLIMBOUT. LIGHT WAS ON FOR APPROX 14 MINS. RETURNED TO SJO, EMERGENCY LANDING. DURING T/S, FOUND DISPLAY TEST BUTTON STUCK IN OPEN PISITION, REMOVED AND REPLACED COMPARTMENT OVERHEAT DETECTION CONTROL UNIT IAW AMM 26-18-01.