What was found
ICT - FLIGHT 5931, THE CREW REPORTED A VERY LOUD NOISE FROM TAKEOFF TO LANDING, AND BELIEVED THAT THE NLG DOORS WERE OPEN. THE AIRCRAFT RETURNED TO ICT WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NOSE LANDING GEAR SOLENOID VALVE, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.