What was found
(CAN) ENROUTE, THE NR 2 HYDRAULIC SERVO CAS MESSAGE ILLUMINATED INTERMITTENTLY. ACFT DIVERTED, AFTER LANDING THE NR 2 HYDRAULIC SERVO CAS MESSAGE WAS ON STEADY. SYSTEM WAS TROUBLESHOT AND FAULTY SWITCH ON THE NR 3 SERVO, LOWER POSITION, WAS REPLACED WITH NEW ONE. SYSTEM LEAK AND FUNCTION CHECKED OK. ACFT RETURNED TO SERVICE.