As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF THE CREW SELECTED THE GEAR UP AND RECEIVED A GEAR DISAGREE MESSAGE. THE AIRCRAFT RETURNED TO FIELD AND LANDED WITH NO FURTHUR ISSUES. MX INTERROGATED PSEU AND FOUND S21 NEAR FLAGGED. ADJUSTED NLG SENSOR PS1GA. OPS CHECK GOOD.