As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT ALTITUDE SELECTOR KNOB ON PRESSURIZATION SYSTEM CONTROL HAS TROUBLE SELECTING DESIRED ALTITUDE. SOMETIMES THE DIGITAL ALTITUDE SELECTED INDICATOR WILL NOT MOVE WITH THE KNOB MOVEMENT. GROUNDED - YES. DUPLICATED PROBLEM - INTERMITTENT. REPLACED CABIN PRESSURE CONTROL MODULE, OPS NORMAL. REF AMM TASK 21-31-02/401.