As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT AFTER TAKEOFF THEY RECEIVED A LG AIR & GND FAIL MESSAGE & THAT THE LG WOULD NOT RETRACT. THE CREW RETURNED TO FIELD & LANDED WITHOUT INCIDENT. THE ACFT WAS FOUND SAFE FOR FERRY FLIGHT & WAS FERRIED TO KCMH FOR REPAIR. REPLACED BOTH RT MLG WEIGHT ON WHEELS PROXIMITY SENSORS, OPERATIONAL CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED.