As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH PRESSURIZATION MODE CONTROLLER IN AUTO, AUTO FAIL AND ALT ANNUNCIATORS ILLUMINATED. ACFT GROUNDED. FOUND NR 2 CPC WILL NOT TEST OR DISPLAY. REPLACED NR 2 IAW AMM 21-31-01. NR 2 CPC TESTED GOOD IAW AMM 21-31-700-802. TROUBLESHOOTING ACCOMPLISHED IAW FIM 21-31, TASK 827.