As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN ALT AND CABIN RATE OF CHANGE INDICATION DASHED ON GROUND AND IN FLIGHT. CABIN PRESSURE ACQUISITION MODULE. MX PDPU A/C AND ALL INDICATIONS CAME BACK ROA UPON FURTHER INVESTIGATION ALL DISPLAYS WERE FOUND TO FUNCTION PROPERLY. OPS CHECKED PRESSURIZATION SYSTEM IAW MM 21-37-00, OPS CK GOOD CLEAR MEL.