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 WHEN GEAR HANDLE WAS SELECTED TO DOWN POSITION. FLIGHT CREW COMPLETED AN EMERGENCY LANDING GEAR EXENSION AND LANDED WITHOUT INCIDENT. MAINTENANCE JACKED AIRCRAFT AND DUPLICATED PROBLEM. LANDING GEAR TROUBLESHOOTING DETERMINED LANDING GEAR SELECTOR VALVE FAILED. PART WAS REPLACED AND A FUNCTIONAL CHECK OF THE GEAR SYSTEM WAS NORMAL.