As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT AFTER FLIGHT CONTROL CHECK, RUDDER RATIO LIGHT CAME ON AND REMAINED ON. REMOVED AND CLEANED CANNON PLUGS ON BOTH UPPER AND LOWER RUDDER RATIO UNITS. PERFORMED RUDDER RATIO CHECK PER BOEING MAINTENANCE MANUAL 27-21-12, PROCEDURE GROUND CHECKS NORMAL. RUDDER RATIO SHOWS EQUAL TRAVEL ON BOTH RUDDERS, LIGHT STAYED OUT.