As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR WOULD NOT RETRACT WHEN GEAR UP SELECTED. THREE RED LAMPS. CREW DECLARED AND EMERGENCY AND AIRCRAFT RETURNED TO ASE AND WAS INSPECTED BY MX AND A FERRY FLIGHT WAS PERFORMED TO MAINTENANCE BASE IN DENVER. MAINTENANCE REMOVED AND REPLACED THE STEERING CONTROL UNIT AND PERFORMED A LANDING GEAR RETRACTION/EXTENSION TEST. AC WAS RETURNED TO SERVICE.