As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YELLOW RUDDER RATIO CAUTION MESSAGE ILLUMINATED TWICE MOMENTARILY. NOTICED SLIGHT YAWING MOVEMENT ON CLIMBOUT BUT NOTHING IN CRUISE. NO FAULTS LATCHED ON RUDDER RATIO MODULES OR SAM MODULES. NO ECS FAULTS. REPLACED RT RUDDER RATIO CHANGER MODULE PER MM. ALL TEST OK.