As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 3775, THE CREW REPORTED AN AIR / GROUND FAIL MESSAGE AFTER TAKEOFF. THE GEAR WAS CYCLED TWO TIMES WITH NO HELP. THE AIRCRAFT RETURNED TO IAH WITHOUT INCIDENT. MAINTENANCE ADJUSTED THE RIGHT HAND AIR / GROUND PROXIMITY SENSOR, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.