As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RUDDER RATIO EICAS CAUTION MESSAGE DISPLAYED AFTER ENG START. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE PERFORMED BFIM 27-21 FT 804, NO DEFECTS NOTED AT THIS TIME. STARTED BOTH ENGINES. RUDDER RATIO LIGHT EXTINGUISHED AS REQUIRED. AIRCRAFT RETURNED TO SERVICE.