What was found
AIRCRAFT EXPERIENCED UNCOMMANDED HARD LT YAW CAUSED BY YAW DAMPER. OPERATION CHECK OF A AND B YAW DAMPER SYSTEMS GOOD, SPZ-8000 DIAG. TEST GOOD. RUDDER SERVO OPERATION CHECK GOOD, FLIGHT GUIDANCE, FGC'S, AND AHRS SYSTEMS CHECK GOOD IAW MFG SPZ-8000 AFCD MM SECTION 4.