As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PUSHED AND STARTED ENGINES. RUDDER RATIO LIGHT WAS ON WHEN WE DID THE AFTER START CHECKLIST. CAME BACK TO GATE AFTER MAINT ADVISED. AIRCRAFT GROUNDED BY MAINTENANCE. MAINTENANCE RESET RUDDER RATIO MODULE L AND R PER FIM 27-09 F7 803. NO MSG OR LIGHTS DISPLAYED. AIRCRAFT RETURNED TO SERVICE.