As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED GEAR DISAGREE MESSAGE ON TAKEOFF AND NOTED SIX (6) SECONDS FROM LEVER TO MESSAGE. CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT AND FOUND SELECTOR VALVE NOT ALLOWING NOSE GEAR TO COME UP. MAINTENANCE REMOVED AND REPLACED LANDING GEAR SELECTOR VALVE AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.