As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, THE LANDING GEAR RED UNSAFE LIGHT REMAINED ILLUMINATED. THE LT MAIN GEAR GREEN LIGHT ILLUMINATED ABOUT 10 SECONDS LATER FOLLOWED BY THE RT. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND A BAD SWITCH IN THE RT MAIN LANDING GEAR ACTUATOR. THE ACTUATOR WAS REPLACED GEAR SWINGS WERE PERFORMED AND SYSTEM OPS OK. AIRCRAFT WAS RETURNED TO SERVICE.