As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR DISAGREE MESSAGE UPON ATTEMPTED RETRACTION OF L/G. ACFT RETURNED TO FIELD. MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR SELECTOR LEVER AND THE NLG PROXIMITY SENSOR. LANDING GEAR OPERATION CHECK SATISFACTORY. ACFT RELEASED TO SERVICE.