As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LDG GEAR DID NOT EXTEND WITH GEAR HANDLE, GRAVITY EXTENSION OK PER CREW DEBRIEF, WHEN GEAR HANDLE CYCLED THERE WAS NO ASSOCIATED AUDIABLE SOUND NORMALLY HEARD DURING GEAR EXTENSION. CREW DID NOT TRY SELECTING LDG GEAR POSITON DET SYSTEM TO "2" DURING ATTEMPTS TO EXTEND GEAR. FOUND THE LANDING GEAR SELECTOR VALVE BAD GND. REMOVED AND REPLACED THE LANDING GEAR SELECTOR VALVE PER MM 32-31-12-4. ALL OPS AND LEAK CHECKS WERE NORMAL OK FOR SERVICE.