As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS FLIGHT 4148, RECEIVED A LANDING GEAR AIR/GROUND FAULT DURING CLIMBOUT. AIRCRAFT RETURNED TO THE FIELD WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THE NOSE GEAR PROXIMITY SENSOR FACE TO BE CRACKED. THE SENSOR WAS REMOVED AND REPLACED, OPERATIONAL CHECKS WERE SATISFACTORY. AIRCRAFT RELEASED FOR SERVICE.