As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT AFTER TAKEOFF & GEAR RETRACTION AN UNSAFE GEAR INDICATION, 3 RED LIGHTS & 1 MAIN GEAR GREEN LIGHT. THE CREW CYCLED THE GEAR BACK DOWN & RETURNED BACK TO THE AIRPORT FOR MAINTENANCE. TROUBLESHOOTING FOUND THE RT NORMAL LG MICRO SWITCH CONTACTS STUCK PN 9006EN42. THE DEFECTIVE SWITCH WAS REMOVED & A NEW SWITCH WAS INSTALLED & ADJUSTED IAW AMM. OPERATIONS CHECKED SATISFACTORY.