As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR HANDLE: AFTER TAKE OFF SELECTED GEAR UP, HANDLE FROZEN IN DOWN POSITION. AMBER CAS, "GROUND DETECT FAULT". FOLLOWED QRH PROCEDURE AND RETURNED FOR NORMAL LANDING. CORRECTIVE ACTION; REPLACED NLG WOW SWITCH IAW CE 700 MM 32-60-10. OPS CHECK GOOD.