As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO FAIL LIGHT ILLUMINATED 1 HOUR INTO FLIGHT. SYSTEM WORKED IN ALTN MODE WITH NO PRESSURIZATION PROBLEMS NOTED. ACFT GROUNDED. NR 1 PRESSURE CONTROLLER SHOWS, "FAULT", "CONTROLLER LRU FAIL". NR 1 CONTROLLER SYS BITE TEST. RESET FAULT. FAULT DID NOT RETURN. BITE TEST NR 1 AND NR 2 CONTROLLER GOOD. REF FIM 21-31-T801. GROUND VERIFICATION GOOD.