As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: ON GEAR EXTENSION, ALL GEAR GREEN LIGHTS, BUT HORN AND ALL RED GEAR LIGHTS ALSO ILLUMINATED. RAN QRH CHECKLIST AND LANDED UNEVENTFULLY. MAINTENANCE FOUND LANDING GEAR CONTROL LEVER STICKY, CLEANED AND LUBRICATED LEVER IN PER FIM 32-30-00-810-810 AND PERFORMED SATISFACTORY OPERATIONAL CHECK.