As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, RECEIVED A "LANDING GEAR AIR/GROUND FAIL" MESSAGE. AIR RETURN AND LANDED WITHOUT INCIDENT. EMERGENCY LANDING WAS NOT DECLARED. ISOLATED DISCREPANCY TO A SHORTED RT MLG SHOCK ABSORBER PROXIMITY SWITCH HARNESS. MX R & R THE HARNESS IAW SWPM 20-21-00. THE ACFT WAS APPROVED FOR RETURN TO SERVICE.