As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, RUDDER RATIO LIGHT ILLUMINATED AFTER ENGINE START AND WOULD NOT EXTINGUISH. A/C RETURNED TO BLOCKS (BTB). VERIFIED SHUTOFF, SERVO, AND LVDT WIRING. FOUND MODULE FAULT BALL ON LEFT UNIT. REMOVED AND REPLACED THE LEFT RUDDER RATIO MODULE, REF. B767 AMM 27-21-00. ALL FUNCTIONS AND INDICATIONS NORMAL. A/C RETURNED TO SERVICE.