What was found
INSPECTION TYPE-N/A, UNCOMMANDED UPPER FULL RT DEFLECTION. A/C STARTED ROLL LOWER RUDDER INPUT OF YAW DAMP CORRECT. UPPER RUD HYD SHUT OFF, RUDDER SLOWLY DRIFTED BACK TO CENTER. LANDED WITH LOWER RUDDER ONLY. *S/D* REMOVED AND REPLACED UPPER YAW IAW MM 22-11-13 OPS CHK GOOD. (P/N 2585800-1) (S/N 0550647) ON, (0661015) OFF.