What was found
FLT 7797 - IAD-RDU - DURING CLIMB AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO LOUD NOISE COMING FROM GEAR WELL. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED NLG SELECTOR VALVE. MAINTENANCE PERFORMED GEAR SWINGS, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)