As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE IN CRUISE WITH LT ENGINE FEATHERED FOR CUSTOMER ACCEPTANCE FLIGHT ABOVE 145 KNOTS WITH RUDDER IN LOW PRESSURE MODE, THERE WAS NO MOVEMENT OF RUDDER. RIGHT RUDDER LOCKED. BELOW 145 KNOTS WITH RUDDER OPERATING IN HIGH PRESSURE MODE, THERE WAS NO PROBLEM. (X)