What was found
BWI - FLT 2635 - DURING CRUISE, EN ROUTE FROM BOS TO FLL, FLIGHT LOST SYSTEM A HYDRAULICS. CREW ACCOMPLISHED QUICK REFERENCE HANDBOOK PROCEDURES AND DECLARED AN EMERGENCY. FLIGHT DIVERTED TO BWI AND LANDED WITHOUT INCIDENT. AIRCRAFT WAS TOWED TO THE GATE. MAINTENANCE FOUND A BROKEN O-RING FOR THE NR 6 SPOILER. REPLACED O-RING. ALSO, REMOVED AND REPLACED CASE DRAIN FILTERS FOR SYSTEM A HYDRAULICS. SERVICED HYDRAULIC SYSTEM. OPERATIONAL CHECK AND LEAK CHECK GOOD. (M)