As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE AND ON DESCENT OBSERVED OUTFLOW VALVE FLUCTUATING. AUDIBLE FLUCTUATIONS IN PRESSURE AIR FLOW CHANGES. EAR POPPING. VALVE MOVED FROM 3/4 CLOSED TICK TO 1/2 TICK EACH TIME.(<P>REMOVED AND REPLACED #1 AUTO PRESSURE CONTROLLER IAW AMM 21-31-02. OPS CHECK SAT AT THIS TIME. NO FAULTS PRESENT.</P>)