As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF FROM HSV, CREW REPORTED LANDING GEAR DISAGREE AND NOSE DOOR OPEN MESSAGES WHEN THE LANDING GEAR HANDLE WAS SELECTED UP. CREW RETURNED TO HSV AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT THE AIRCRAFT, REMOVED AND REPLACED THE 3A HYDRAULIC PUMP AND PERFORMED CHECKS USING THE AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT WAS RELEASED FOR SERVICE.