What was found
PILOT REPORTED AN UNCOMMANDED STICK MOVEMENT FORWARD, RESULTING IN PITCH DOWN AND AUTOPILOT TURNING OFF. MX RESET THE INTEGRATED AVIONICS COMPUTER AND CLEANED THE ELEVATOR SERVO CONNECTIONS. SEVERAL OPS CHECKS WERE PERFORMED WITH NO DISCREPANCIES NOTED, ACFT RETURNED TO SERVICE. NO SPECIFIC PART IS IDENTIFIED AS CAUSING THE DIFFICULTY, IT APPEARS TO HAVE BEEN A SYS GLITCH.