As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LNK FLT 6177 - THE CREW REPORTED A LANDING GEAR AIR/GROUND FAIL MESSAGE AFTER TAKEOFF. THE AIRCRAFT RETURNED TO LNK AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND REPLACED THE LANDING GEAR ELECTRONIC UNIT. OPERATIONAL CHECKS WERE GOOD.