As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, RETRACTED MLG AND RECEIVED A RED UNSAFE INDICATION THAT STAYED ON WITH ALL 3 GREEN LIGHTS EXTINGUISHED. LEVELED OFF AT 5,000 FT & MAINTAINED SPEED BELOW 200 KTS WHILE RUNNING CHECKLISTS & THEN RETUNED TO LAND. NO OTHER INDICATION WAS DETECTED TO SUSPECT THAT ANY OF THE 3 WAS STILL EXTENDED OR HANGING OUT. LANDING GEAR EXTENSION WAS NORMAL AND LANDING WAS UNEVENTFUL. PERFORMED FUNCTIONAL CHECKS. FOUND RT UPLOCK SWITCH FAILING ON THE HYD CONTROL CIRCUIT. R & R THE RT UPLOCK SWITCH IAW THE MM 32-30-05. OP'S CHECKED NORMAL.