As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN AUTO ONE PRESSURA TION CONTROLLER FAILURE RESULTING IN CAB IN HIGH ALT WARNING AUTO PRESSURE CONTROL 2 STATUS MESSAGE. CONTROLER FAILS BIT TEST. REMOVED AND REPLACED CABIN AUTO PRESS CONTROLER PER TASK 21-31-02-004-001 AND TASK 21-31-02-404-005. STATUS MESSAGE CLEARED. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1059185 SN OFF 0332 CONTROLLER, CAB OFF 19-2131-9-0004 0332 ON 19-2131-9-0004 0119