What was found
(CAN) THE PILOT WAS DOING PRE FLIGHT HYDRAULIC TEST IAW FLIGHT MANUAL REQUIREMENTS IAW AWD CF-2003-15R3 AND NOTICED A STIFFNESS IN THE FLIGHT CONTROLS. THE AIRCRAFT WAS SHUT DOWN. AN ENGINEER WAS NOTIFIED AND STARTED TO TROUBLESHOOT THE PROBLEM. THIS SERVO WAS REMOVED AND THE DEFECT WAS RESOLVED. THE AIRCRAFT WAS RETURNED TO SERVICE. THIS IS THE INITIAL REPORT SINCE THE AIRCRAFT IS OUT IN THE FIELD AND REPORTING IS DIFFICULT. THE ENGINEER SUSPECTS THE CHECK VALVE IN THE ACCUMULATOR BLOCK WAS THE PROBLEM. THE AFFECTED SERVO WILL BE IN CITY LATER.