As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT, PRESSURIZATION PANEL AUTO FAIL AND ALTN LIGHTS WERE ILLUMINATED WITH SYSTEM IN AUTO. ACFT GROUNDED. CYCLED SWITCH ON PRESSURIZATION PANEL MODE SELECTOR TO MANUAL, AND THEN BACK TO AUTO. THE AUTO FAIL LIGHT REMAINS EXTINGUISHED WITH SELECTOR IN AUTO. PERFORMED FIM TASK 21-31, TASK 801. SYSTEM OK.