What was found
(CAN) AFTER COMPLETING THE DECENT CHECKS, THE CREW ATTEMPTED TO REDUCE POWER ON BOTH ENGINES. THE POWER LEVER FOR THE RT ENGINE WOULD NOT MOVE. ALL ATTEMPTS TO MOVE THE POWER LEVER WERE UNSUCESSFUL SO THECREW ELECTED TO SHUT THE RT ENGINE DOWN. ON THE GROUND, MAINTENANCE LUBRICATED THE CABLE AND IT APPEARED TO FUNCTION NORMALLY. HOWEVER, UPON RETURN TO BASE THE CREW DISCOVERED THE SAME FAULT. INVESTIGATION REVEALED THE CASE ON THE CABLE WAS SPLIT IN NUMEROUS PLACES AND THE MOISTURE HAD ENTERED INTO THE STRANDS CAUSING CORROSION.