As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE & NOSE DOOR OPEN RED WARNING MESSAGE AFTER CALL FOR GEAR UP. 3 SECONDS LATER, MESSAGE EXTINGUISHED WITH NO FURTHER INCIDENT. FLIGHT 4223 CLOSED DEFERRED LANDING GEAR RETRACTION SYSTEM. MX ACTION COMPLIED WITH AND PLACARDS INSTALLED. CAT 2 NOT AUTHORIZED.