What was found
THE LEFT AUTOPILOT SELF-ENGAGED DURING TAKEOFF. ABORTED TAKEOFF AND RETURNED TO THE GATE. THE LEFT AUTOPILOT WAS DEACTIVATED AND DEFERRED PER MEL. CHECK-C 2-20-00 LAX. ---OPEN--- S/D. THE AUTOFLIGHT CONTROL SYSTEM MODE CONTROL PANEL (MCP) WAS REPLACED. THE MANUFACTURER TESTING SHOWED THE MCP A SIDE PROCESSOR WAS NOT PROPERLY RETURNING FROM A PROCEDURE CALL, AND SIGNIFICANT PROBLEMS WITH THE INTERFACE TO THE RAM MEMORY DEVICES. THESE MCP FAILURES CAN CAUSE THESE UNCOMMANDED AUTOPILOT ANOMALIES TO OCCUR. THIS IS A CORRECTION.