As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLIGHT 2048 - AIRCRAFT RETURNED TO FIELD AFTER THE RUDDER PRESSURE CAUTION LIGHTS CAME ON DURING TAKEOFF. MAINTENANCE REMOVED AND REPLACED RUDDER DUAL PRESSURE REGULATOR AND PERFORMED OPERATIONAL CHECKS. OPERATIONAL CHECKS WERE GOOD, NO DEFECTS NOTED.