As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT MLG RED LIGHT ILLUMINATED ON TAKEOFF. AFTER GEAR LEVER CYCLED TO UP POSITION, CYCLED LANDING GEAR PUT HANDLE IN 'OFF' POSITION AND RT MLG FELL TO DOWN POSITION. REST OF FLIGHT WITH HANDLE IN 'UP' POSITION. ALL OTHER INDICATIONS NORMAL. INSTALLED UPLOCK SPRINGS PER MM.