As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTURE LANDING GEAR WOULD NOT RETRACT. GEAR HANDLE WOULD NOT MOVE OUT OF THE DOWN POSITION. THE GEAR INDICATION WAS 3 GREEN AT ALL TIMES. REMOVED LANDING GEAR CONTROL BOX. APPLIED POWER TO PINS P & K TO ACTUATE SOLENOID. SOLENOID FAILED. INSTALLED LANDING CONTROL BOX IAW MM 34-003 AND PERFORMED FUNCTION TEST IN NORMAL MODE OF LANDING GEAR IAW MM 32-300. OPS CHECKED GOOD.