As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A LANDING GEAR AIR/GROUND FAIL MESSAGE AFTER TAKEOFF. THE GEAR WOULD NOT RETRACT. THE AIRCRAFT RETURNED TO STL AND LANDED WITHOUT INCIDENT. MAINTENANCE PERFORMED AIR/GROUND OPERATIONAL CHECKS ALONG WITH LANDING GEAR OPERATIONAL CHECKS. NO DEFECTS WERE FOUND. THE AIRCRAFT WAS RELEASED FOR SERVICE.