What was found
(CAN) HOLD NOSE UP WARNING, USING AUTOPILOT ON DESCENT, PILOT HAD TO HOLD CONTROL, DISCONNECT AUTOPILOT, TRIM NOSE UP AND CONTINUE WITHOUT AUTOPILOT. IT WAS FOUND THAT THE SECONDARY MOTOR, USED BY THE AUTOPILOT, ON THE PITCH TRIM ACTUATOR WAS UNSERVICEABLE, VERY NOISY, AND WOULD NOT MOVE SMOOTHLY THROUGHOUT HIS TRAVEL. PITCH TRIM ACTUATOR REPLACED, PROBLEM SOLVED.