As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYDRAULIC SYSTEM 1 WENT TO AMBER ON THE EICAS DURING FLIGHT. AIRCRAFT DIVERTED INTO TYS FROM RIC. MAINTENANCE REMOVED AND REPLACED THE LT RUDDER ACTUATOR PRESSURE SWITCH AND THE HYDRAULIC LINE. SERVICED WITH HYD FLUID, OPS AND LEAK CHECKED GOOD. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE.