As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MAIN GEAR SHOWED NO GREEN LIGHTS WHEN GEAR WAS SELECTED DOWN. THE GEAR UNSAFE LIGHT WAS NOT ILLUMINATED. GEAR INDICATED DOWN AND LOCKED USING ALTERNATE INDICATION SYSTEM. DECLARED EMERGENCY. LANDING WAS UNEVENTFUL. REPLACED LEFT MAIN GEAR DOWN LOCK SWITCH. OPS CHECKED GOOD.