As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR WOULD NOT EXTEND, FOUND LANDING GEAR ACTUATOR DOWN LIMIT SWITCH STUCK IN GEAR DOWN POSITION. PERIODIC REPLACEMENT OF SWITCH WOULD BE THE ONLY WAY TO PREVENT REOCURRENCE. THE SWITCH IS A SEALED UNIT AND CANNOT BE INSPECTED INTERNALLY. (GL17200402312)