As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT, NOTICED GREEN ALTN LIGHT ILLUMINATED ON OVERHEAD PRESSURIZATION PANEL ALSO AMBER AUTO FAIL LIGHT ILLUMINATED. ACFT GROUNDED. PERFORMED BITE ON CABIN PRESS CONTROLLERS OPS NORMAL, NO DEFECT NOTED, ALTN GREEN LIGHT AND AMBER AUTO FAIL LIGHT EXTINGUISHED REF FIM 21-31, TASK 801.