As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 400 CREW GOT A VIBRATION AND NOTICED RATE INDICATOR ON PRESS PANEL FLUCTUATING UP AND DOWN(<P>REF AP-19049, REPLACED OUTFLOW VALVE ASSY IAW AMM 21-31-03, OPS CK GD. REMOVED AND REPLACED #2 AUTO PRESSURE CONTROLLER IAW AMM 21-31-02 OPS CK GD.</P><P>VALVE S/N OFF 99-1097 P/N OFF 606832-21</P>)