As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RUDDER INDICATOR WAS FULL LEFT. IT TOOK 5 1/2 UNITS TO MAINTAIN STRAIGHT AND LEVEL. WHEN THE RUDDER TRIM WAS MOVED TOWARD ZERO THE AIRCRAFT MADE AN AGGRESSIVE ROLL TO THE LEFT. DID NOT TRY TO FLY AIRCRAFT WITH YAW. REMOVED AND REPLACED ROLL SERVO DRIVE IAW DC-8 M/M 22-10-4, NO HELP. REMOVED AND REPLACED RUDDER TRANSFER VALVE IAW DC-8 M/M 27-21-6, OPS CHECKS SERVICEABLE.