As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RUDDER RATIO DISCRETE LIGHT ILLUMINATED AS WELL AS RUDDER RATIO EICAS MESSAGE ILLUMINATED AFTER ENGINE START. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE REPLACED RUDDER RATIO CHANGER SERVO VALVE IAW AMM 27-21-15. AIRCRAFT RETURNED TO SERVICE.