As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DESCENDING THRU FL240 AT 320 KNOTS, CREW FELT A TAIL KICK, BUMP, MULTIPLE TIMES. OBSERVED RUDDER ON FLIGHT CONTROL PAGE MOVING RT & LT. DISCONNECTED AUTO PILOT & BUMP CONTINUED. SLOWED ACFT TO 270 KNOTS & IT SUBSIDED BUT FELT IT & OBSERVED IT AGAIN MULTIPLE TIMES UNTIL LANDING. R & R FAC 1 IAW AMM 22-66-34-400-002-A. OPERATIONS CHECKED IAW AMM 22-96-00-710-001. R & R NR 1 YAW DAMP SERVO ACTUATOR IAW AMM 27-26-51-400-001-A. OPERATIONS CHECKED IAW AMM 22-63-00-710-001-A.