As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED, RECEIVED A LANDING GEAR AIR/GROUND FAIL MESSAGE AND MULTIPLE AURAL WARNINGS REGARDING THE FLAPS AND TRIM AFTER TAKEOFF. RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LANDING GEAR ELECTRONIC UNIT. OPERATIONAL CHECKS AND LANDING GEAR SWINGS WERE GOOD WITH NO FURTHER DEFECTS NOTED.