As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 320 AND .88 MACH THE UPPER RUDDER YD STARTED BOUNCING OFF THE LEFT SIDE OF THE RUDDER LIMITER WITH THE UPPER YD IN THE B-CHANNEL, IT WOULD NOT HAPPEN ON THE A-CHANNEL. AT SPEED & ALTITUDE THE RUDDER HAD TO BE TRIMMED TO THE LEFT EXCESSIVELY. REMOVED UPPER RUDDER ACTUATOR DUE TO INTERNAL LEAKAGE. REPLACEMENT ACTUATOR INSTALLED IAW CE-750 MM CH 27-24-01. OPS CHECK GOOD.