What was found
FLT 7000 WITH 56KN DIRECT CROSS WIND FROM RT, A/C HAD CONTINUOUS SMOOTH UNCOMMANDED RUDDER INPUTS. YAW DAMPER INDICATIONS WERE 1/2 LEFT TO 1/3 RIGHT DISPLACEMENT. THIS CONDITION LASTED FOR AS LONG AS WIND WAS REG L/P 8751429 FOR CORRECTIVE ACTION.. LOG PG 8751429 CONT, WITH A/P ON AND OFF NO CHANGE. EMERGENCY WAS DECLARED FOR LANDING PRIORITY. C9005 STA EWR 27 FEB 11 ATA 02700 / NO EICAS MSG NOTED, NO MX MSG NOTED. PERFORMED PFCS ACTUATOR / CONFIDENCE, ACTUATOR CONTROL ELE MONITOR TEST AND GUST SUPPRESSION PRESSURE TRANSDUCER TEST PER FIM. ALL TEST PASSED. NO FAULTS NOTED.