As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - CREW RETURNED TO FIELD WHEN AFTER TAKEOFF AND PASSING 140KTS, THEY RECEIVED CAUTION LIGHTS FOR "RUDD FULL PRESS" AND "RUDD PRESS". BELOW 14O KTS THE LIGHT WENT OUT. MAINTENANCE INSPECTED THE AIRCRAFT AND REPLACED THE RUDDER DUAL PRESS REGULATOR IAW THE MAINTENANCE MANUAL. OPERATIONAL CHECKS AND LEAK CHECKS WERE GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.