As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 3994 - DURING FLIGHT, PILOT REPORTED THE LANDING GEAR WOULD NOT RETRACT. THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT WHERE MAINTENANCE REMOVED AND REPLACED THE GEAR HANDLE, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (X)