What was found
CYAN MESSAGES "AP FAIL L-R AND YD FAIL A-B" IN FLIGHT AT FL 370. AP WOULD NOT RE-ENGAGE. WHEN AP DISCONNECTED, A SLIGHT BUMP WAS FELT IN THE ROLL / AILERONS OF CONTROL WHEEL. COULD NOT DUPLICATE FAILURE ON THE GROUND SO PROCEEDED WITH RUDDER SERVO CHARGE. REMOVED AND REPLACED RUDDER SERVO IAW MM 22-10-00. FOUND SERVERAL PINS PUSHED BACK IN CONNECTOR TO SERVO THAT MAY HAVE CONTRIBUTED TO FAILURE. RESEATED PINS. OPERATIONAL CHECK OF AUTOPILOT SYSTEM WAS GOOD. RUDDER SERVO CHECKS GOOD.