What was found
DURING STATIC T/O POWER APPLICATION AT APPROX 90 PERCENT N1, RT RUDDER MOVED FWD UNCOMMANDED, THEN RUDDER BIAS LIGHT ILLUMINATED. INSPECTED RUDDER BIAS PLUMBING IN TAILCONE, NO DEFECTS NOTED. INSPECTED RUDDER BIAS ACTUATOR. NO DEFECTS NOTED. C/W GROUND RUN, CONFIRMED THAT RUDDER BIAS FAILED. REMOVED AND REPLACED RUDDER BIAS CONTROL VALVE IAW MM 27-20-05. C/W GROUND RUN. NO DEFECTS NOTED.