As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED A GEAR DISAGREE MASTER WARNING MESSAGE ON CLIMB OUT. COMPLETED THE EMERGENCY/NON-NORMAL PROCEDURE IN THE POM - 7,10,4. NOSE WHEEL WAS THE ONLY ONE IN DISAGREEMENT. RETURNED TO THE NEAREST SUITABLE AIRPORT. LANDED WITHOUT INCIDENT. FOUND PSEU FAULT CODE S22 FAR NGUPLK. INSPECTED NLG AND NLG DOORS, NO DEFECTS NOTED. SWUNG LANDING GEAR REPEATEDLY IAW AMM CH 32-30-00, NO DEFECTS NOTED. ALL CHECKS GOOD.