As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THE CREW REPORTED A LANDING GEAR AIR GROUND FAIL MESSAGE. ACFT RETURNED TO DEPARTURE WHERE IT LANDED WITHOUT INCIDENT. MX REMOVED AND REPLACED THE LT MAIN GEAR WOW PROXIMITY SWITCH ON THE SHOCK ABSORBER, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.