What was found
PITCH TRIM ISSUE WAS CONFIRMED AFTER NOTICING A CONSTANT BUFFETING AT FL400,I FELT THE PITCH TRIM WHEEL CLICKING , DISCONNECTED THE AUTOPILOT AND IMMEDIATELY NOTICED THE AUTO PITCH TRIM WAS AT THE FULL PITCH DOWN POSITION AND THE YOKE NEEDED FORWARD PRESSURE TO MAINTAIN FL400. PITCH TRIM MISS-COMPARE ANNUNCIATION CAME IN DURING THIS TIME,. I CALLED MX CONTROL TO ASK WHERE THEY WANTED US TO GO FOR MAINTENANCE AND THEY TOLD ME PBI.