What was found
PDX - AT CRUISE ALTITUDE WITH AN SAT OF -25'C, RECEIVED AN ADVISORY DISPLAY MESSAGE MISTRIM. PITCH TRIM WHEEL WAS DIFFICULT TO MOVE IN EITHER DIRECTION. AIRCRAFT LANDED WITHOUT INCIDENT. INSPECTED ELEVATOR TRIM TAB ACTUATOR, SERVO, AND CABLE RUN WITH NO DEFECTS NOTED. LUBRICATED ELEVATOR TRIM ACTUATOR. CYCLED TRIM THROUGH FULL RANGE SEVERAL TIMES, NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE, NO COMPONENTS REPLACED.