As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT AND AFTER ENGINE START "RUDDER RATIO" EICAS MESSAGE DISPLAYED. AIRCRAFT RETURNED TO BLOCKS (BTB). C/W FIM 27-21 FT 804 NO FAULTS NOTED AT THIS TIME OPS TEST OF RUDDER AND RUDDER TRIM CONTROL SYS GOOD IAW AMM 27-21-00 NO FAULTS NOTED AT THIS TIME. AIRCRAFT RETURNED TO SERVICE.