As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF ON GEAR RETRACTION GOT ALL 3 GREEN LIGHTS AND THE RED UNLOCK LIGHT STAYED ON. COULD HEAR THE LOUD AIR NOISE AND THE GEAR CYCLING AT LEAST 4 TIMES. FINALLY THE GEAR CAME COMPLETELY UP AND THE UNLOCK LIGHT WENT OUT. JACK AIRCRAFT & CONFIRMED DISCREPANCY. SERVICE NOSE STRUT IAW CE750 MM 12-10-38. NOTE: NOSE STRUT FAILED TO EXTEND PRIOR TO RETRACTION. CYCLED LANDING GEAR FIVE TIMES WITH NO DEFECTS NOTED IAW CE750 MM 32-30-00.