What was found
AFTER LEVELING OFF AT 7000' ON DESCENT INTO AIRPORT/ADVANCED POWER TO MAINTAIN AIRSPEED ( APPROX. 225KTS) WHICH CAUSED ACFT TO BE UNCOORDINATED (BALL OUT TO RT SIDE) APPLIED RT TO RE-COORDINATE. INITIAL APPLICATION OF PRESSURE ON RUDDER (NORMAL PRESSURE) PRODUCED NO MOVEMENT WITH CONTINUED AND INCREASED PRESSURE RUDDER PEDAL BROKE FREE (POPPED FREE). NO OTHER OCCURANCES REMAINDER OF FLIGHT. AUTO PILOT WAS ENGAGED. LANDING UNEVENTFUL. REMOVED FLOORBOARDS AND PANELS TO GAIN ACCESS TO ENTIRE RUDDER CONTROL SYS, INSPECTED FOR CONDITION OF CABLES, PULLEYS AND FOR ANY POSSIBLE DEFECT. NO DEFECT NOTED. RII'S C/W. R & R ORIGINAL YAW DAMPER AFTER GVI NO DEFECT NOTED. NO DEFECTS WERE NOTED DURING ALL RIGGING & OPS CHECKS. PERFORMED OPS CHECK/TEST OF RUD. CONTROL SYS. NO DEFECTS NOTED. FREEDOM OF MOVEMENT CHECK FROM PILOT AND CO-PILOT POSITIONS, NO DEFECT OR JAMS NOTED. REPLACED RUDDER FEEL AND SUMMING UNIT ALL OPS CHECKS GOOD NO DEFECTS NOTED. CHECK FLIGHT GOOD. RETURNED TO SERVICE.