As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO AND MANUAL PRESSURIZATION MODES INOPERATIVE. PRESSURIZATION GOES UP AND DOWN ON ITS OWN WITH ALTITUDE. R & R AUTO OUTFLOW VALVE OPS CHECKED GOOD, R & R GROUND CONNECTION VALVE PERFORMED PRESSURIZATION CHECK. OPS CHECKED GOOD. NO DEFECTS NOTED