As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH AUTO PILOT SELECTED TO F/O SIDE, CANNOT TRIM RUDDER AND RUDDER PEDALS ARE HARD TO MOVE (WITH AUTO PILOT DISENGAGED). IF AUTO PILOT IS ENGAGE THERE IS A SUDDEN YAW AND PEDALS STILL CANNOT BE TRIMMED. EVERYTHING OPERATES NORMAL WHEN AUTO PILOT IS SELECTED TO CAPTS SIDE. MEL 22-11-1. REPLACED FAULTY RUDDER SERVO IAW MM 22-10-05. OPS CHECKS GOOD IAW MM 22-10-00. P/N ON: 622-5734-002, S/N: 1013, S/N OFF 7389.