As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2092, ON CLIMB-OUT OF PDX THRU 1000' CAUTION LIGHT RUD FULL PRESS ILLUMINATED FOLLOWED BY RUD PRESS. AS AIRSPEED INCREASED THRU 140K'S RUD HYD CAUTION ILLUMINATED. MAINTENANCE REPLACED DUAL PRESSURE REGULATOR. AIRCRAFT RELEASED FOR OPERATIONAL CHECK FLIGHT. OPERATIONAL CHECK FLIGHT SATISFACTORY.