As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF, RT MAIN LANDING GEAR DOWN LIGHT (GREEN) REMAINED ON WITH NO UNSAFE LIGHTS ON. LIGHT EXTINGUISHED AFTER 2O MINUTES. MAINTENANCE ACTION FOUND FROZEN LANDING GEAR DOWN SWITCH. AIRCRAFT WASHED PREVIOUS DAY AND LEFT OUTSIDE IN EXTREME COLD TEMPERATURE. SWITCH DRIED AND CLEANED.