As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GEAR RETRACTION THE RED GEAR UNSAFE LIGHT REMAINED ILLUMINATED AND THE RIGHT MAIN GEAR DOWN LIGHT ILLUMINATED. A GROUND OBSERVER NOTICED THAT THE RIGHT GEAR RETRACTED AND THEN EXTENDED. AFTER SLOWING THE RIGHT GEAR RETRACTED AND RED LIGHT WENT OUT. CYCLED LANDING GEAR SEVERAL TIMES, SYSTEM OPS CHECK IAW CE 560 MM CHAPT 32-30-50. NO HANDLE INDICATION, 3 GREEN IN DOWN POSITION, OPS NORMAL.