As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT RUDDER BOOST INOPERATIVE. FOUND RIGHT RUDDER BOOST CHECK VALVE NOT CHECKING-FLOWING BOTH DIRECTIONS CAUSING LEFT ENGINE BLEED PRESSURE TO BE FELT ON BOTH SIDES OF RUDDER BOOST DIFFERENTIAL PRESSURE SWITCH CAUSING NO PRESSURE DIFFERENCE TO BE FELT CAUSING LT RUDDER BOOST TO FAIL. (X)