As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 3684 - THE PILOT REPORTED A SEVERE VIBRATION WAS FELT AFTER THE LANDING GEAR WAS SELECTED TO THE UP POSITION. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT AND MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR CONTROL BOX, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (X)