As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT DURING THE APPROACH FOR LANDING WHEN THE GEAR WAS SELECTED DOWN THE LG DID NOT EXTEND, 3 WHITE GEAR LIGHTS, BUT NO GREEN LIGHTS. ON THE SECOND ATTEMPT THE GEAR EXTENDED NORMALLY & LOCKED DOWN. TROUBLE SHOT & FOUND THE LG SELECTOR SWITCH TO BE DEFECTIVE. REMOVED THE CTR SWITCH PANEL, INSTALLED A NEW GEAR SELECTOR SWITCH. INSTALLED THE CTR PANEL. OPERATION CHECKS WERE SATISFACTORY. SELECTOR SWITCH PN 455188576-131T. ACFT RETURNED TO SERVICE.