As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COS - PILOT REPORTED THAT UPON SELECTING GEAR UP THE LANDING GEAR DID NOT RETRACT. THE AIRCRAFT RETURNED TO COS AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS FERRIED TO IAH WHERE MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR CONTROL LEVER. THE LANDING GEAR SYSTEM OPERATIONALLY TESTED SATISFACTORILY AND RETURNED TO SERVICE.