As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN EXTENDING GEAR IN KSM, NONE OF THE GREEN INDICATORS FOR THE GEAR DOWN & LOCKED INDICATION ILLUMINATED. RAN THROUGH QRH. RETURNED TO ANC, FLEW BY TO VISUALLY CONFIRM GEAR DOWN. LANDED WITHOUT INCIDENT. REMOVED AND REPLACED LIGHT BULBS IN GEAR DOWN POSITION INDICATOR LIGHTS & OPS CHECKED GOOD.