As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3048, RDU TO LGA - CREW RECEIVED A LANDING GEAR AIR/GROUND FAIL MESSAGE UPON ROTATION. THE LANDING GEAR LEVER COULD NOT BE MOVED TO THE UP POSITION. THE AIRCRAFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS INSPECTED AND FOUND SAFE FOR FERRY FLIGHT TO SDF. IN SDF, THE NOSE LANDING GEAR WOW PROXIMITY SWITCH HARNESS WAS FOUND BAD AND WAS REPLACED. THE LANDING GEAR WAS SWUNG MULTIPLE TIMES WITH NO FURTHER DEFECTS NOTED.