As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BZN - UPON APPROACH, AIRCRAFT STARTED TO YAW LEFT AND RIGHT AFTER SELECTING 40 DEGREE FLAP SETTING. PILOT TURNED OFF YAW DAMPER AND YAW PROBLEM WAS CORRECTED. PLACARDED PER MEL 22-3. ON JANUARY 31, 1995, MAINTENANCE REPLACED YAW DAMPER COUPLER AND THE RUDDER PCU. SYSTEM CHECKED OKAY. REFERENCE CONTROL NR 95ZZZX784. (X)