As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT - FLT 386 - ON CLIMB-OUT OF CLT, THE EQUIPMENT COOLING OFF LIGHT ILLUMINATED. SWITCHED TO ALTERNATE, BUT OFF LIGHT REMAINED ON. FLIGHT RETURNED TO FIELD AT CLT AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE EQUIPMENT COOLING AIRFLOW SENSOR. NORMAL AND ALTERNATE SYSTEMS GROUND CHECK GOOD PER MM 21-58-00. (M)