As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND AUTO FAIL & ALTN LIGHT ON AT PREFLIGHT ON PRESSURIZATION PANEL. ACFT GROUNDED. SELECTED CONTROL PANEL TO MANUAL THEN RETURNED TO AUTO AND ALL FAULT INDICATIONS EXTINGUISHED. BITE CHECKS OF PRESSURE CONTROLLER 1 AND 2 SHOWS NO CURRENT FAULTS. NO HISTORY LAST 30 DAYS, REF 21-31-827 AND 21-31-801.