As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RUDDER OSCILLATED IN CRUISE FLIGHT (FL270 - 340KTS IAS) FOR APPROX 10 SECS FOLLOWED BY BLUE YD FAIL - B MSG FOLLOWED APPROX 20 SECS LATER BY YELLOW (YD FAIL - AB) MSG OSCILLATIONS. UPPER RUDDER POSITION SENSORS FOUND TO BE OUT OF ADJUSTMENT, AND RUDDER PEDAL (A) SENSOR TO BE NON ADJUSTABLE TO BRING INTO +.5 INCH TOLERANCE. ADJUSTED UPPER RUDDER A+B SENSORS, AND REPLACED (A) RUDDER PEDAL POSITION SENSOR AND ADJUSTED IAW 27-24-01 OF MM. OPS CHECK GOOD. OLD P/N: H517A. OLD S/N: H7594. NEW P/N: H517A. NEW S/N: K4546.