As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 9820 ON DEPARTURE WITH BLEEDS ON 1 AND 2 ON MAX CABIN RATE FLUCTUATED UNCONTROLLABLY BETWEEN MAX CLIMB AND MAX DESCENT. PER CHECKLIST WENT TO CABIN SET NO CHANGE WENT TO MANUAL SOME CONTROL. MAINTENANCE REMOVED PROTECTIVE CAP FROM CONTROLLER CABIN PRESSURE SENSOR PERFORMED FAULT CHECK OF CABIN ALTITUDE PANEL. CHECKED GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.