What was found
PHL - FLT 390 - EN ROUTE FROM CLT-DTW, THE 'A' HYDRAULIC SYSTEM ELECTRIC MOTOR DRIVEN PUMP LOW PRESSURE LIGHT ILLUMINATED WITH THE PUMP CYCLING ON AND OFF. DECISION WAS MADE TO DIVERT TO PHL WHERE THE FLIGHT LANDED WITHOUT INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE 'A' HYDRAULIC SYSTEM ELECTRIC MOTOR DRIVEN PUMP AND ASSOCIATED FILTERS PER MM 29-15-22. OPS CHECK AND LEAK CHECK GOOD. (M)