As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) GEAR UP SELECTION WAS UNSUCCESSFUL. 3 GREEN & 3 RED LIGHTS AT THE SAME TIME. GEAR RECYCLED BUT WITHOUT SUCCESS. WE RETURNED FOR A NORMAL LANDING (NO EMERGENCY DECLARED). CABIN AND PAX BRIEFED AND DEBRIEFED. INVESTIGATION/ACTION HARNESS ASSEMBLY WOW SWITCH ON NOSE WHEEL CENTERING REPLACED.