As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAB ALT AUTO1 STS MSG REF FIM 21-31 TASK 801 , 21-31 TASK 809 AND 21-31 FAULT TREE 803 CANBIN PRESSURE CONTROLLER BITE PROCEDURE . FOUND THE "SELECTOR" FAULT LT ON. REPLACED THE CABIN PRESSURE SELECTOR PANEL AND TEST OK, PER AMM 21-31-01-401. MEL CLOSED AND PLACARD REMOVED.