As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED THAT BOTH CABIN AUTO PRESSURE CONTROLLERS WERE INOPERATIVE DURING CLIMBOUT. PRESSURIZATION WENT TO FULL DESCEND, PRESSURIZING BOTH AUTO CONTROLLERS WENT TO MANUALTO CONTROL CABIN. MAINTENANCE PERFORMED A CONTROLLER BITE TEST IAW AMM 21-32-00-101 AND REPLACED THE NR 1 PRESSURE CONTROLLER IAW AMM 32-32-03. OPS CHECKED NORMAL IAW AMM 21-32-00.