As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE N AMBER CAS: AFTER TAKEOFF THE NOSE GEAR DID NOT RETRACT. THE MAIN GEAR CAME UP AND INDICATED UP. THE QRH DIRECTED THE HANDLE TO BE PLACED IN THE DOWN POSITION (THEN ALL THE GEAR WAS DOWN AND THREE GREEN WAS INDICATED) THEN TO PULL THE BLOW DOWN BOTTLE HANDLE. THERE WAS NO ADVERSE AFFECT ON LANDING OR WITH TAXIING. CORRECTIVE ACTION: REPLACED NLG POWER STEERING SYSTEM. OPS CHECK GOOD. IAW CE-680A AMM 32-30-00.