As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW NOTED "RUDDER BOOST FAILURE" INDICATION SHORTLY AFTER DEPARTURE FROM KRFD, RETURNED TO KRFD. TROUBLESHOOTING INDICATED FAILED R/H ENGINE #1 RUDDER BOOST PRESSURE TRANSDUCER MT106. REPLACED PRESSURE TRANSDUCER WITH NEW PRESSURE TRANSDUCER, RUDDER BOOST SYSTEM FUNCTIONAL CHECKS OK. RECOMMEND MANUFACTURER INVESTIGATE WHETHER AN INFREQUENT FAILURE OR EXCESSIVE FAIL RATE FLEET-WIDE PROBLEM. TRANSIENT AIRCRAFT, PART HISTORY NOT AVAILABLE.