As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT, NOTED PRESSURIZATION AUTOFAIL AND ALTN ANNUNCIATORS ILLUMINATED. ACFT GROUNDED. PRESSURIZATION SYSTEM GROUND TESTED IAW MM TASK 21-31-00-700-802. BOTH CONTROLLERS, OPS CHECKED GOOD, NO FAULT LOGGED AND NO CURRENT FAULT. ALL GROUND VERIFICATION TEST NORMAL. NO HISTORY 30 DAYS.