As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 330, CAB ALTITUDE WARNING AND LOSS OF CABIN PRESSURIZATION. CABIN ALT AUTO 2 AND AUTO 1 ON STATUS PAGE. NR 1 PRESSURE CONTROLLER FAULTS LOW INFLOW. NO PRSOV FAULTS ON ASCTU. REPLACED NR 1 CONTROLLER PER AMM. BITE CHK NR 2 CONTROLLER BITE CHECKS OK. ASCTU BITE CHKS OK. ALSO FOUND ALT SELECT KNOB ON PRESS PANEL STUCK AT 3500. REPLACED PANEL PER AMM. CHECKS OK.