What was found
IAH - FLIGHT 2388, THE CREW REPORTED THAT THE NOSE LANDING GEAR DOORS OPENED BY THEMSELVES IN FLIGHT AT FL370. THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NOSE LANDING GEAR DOOR SOLENOID VALVE, OPERATIONALLY CHECKED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.