As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT THEY RECEIVED A LANDING GEAR AIR/GND FAIL MESSAGE. THE ACFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE SERVICED THE NLG STRUT. OPS CHECKS AND LANDING GEAR SWINGS WERE GOOD WITH NO FURTHER DEFECTS NOTED.