As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FL 171 - FLIGHT DIVERTED TO PIT DUE TO YAW DAMPER AND STAB TRIM PROBLEMS. AIRCRAFT ROLLS SLIGHTLY (DUTCH ROLLS) CONSTANTLY. HIGHER ALTITUDES AND TURBULENCE MAKES ROLLING WORSE. PROBLEM EXISTS WITH AUTOPILOT ON OR OFF. FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE YAW DAMPER COUPLER. BITE TEST AND FUNCTIONAL CHECK NORMAL. (M)