As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED GEAR DISAGREE WARNING MESSAGE AT GEAR RETRACTION. MLG UP AND LOCKED, WHILE NLG BLINKING YELLOW THEN RED. CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT, ADJUSTED PROXIMITY SENSOR PX11 AND PERFORMED CHECKS IAW AMM. ACFT RELEASED FOR SERVICE.