As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO FAIL FL370, SYSTEM SWITCHED TO ALTN AUTOMATICALLY IAW CHECKLIST. SELECTED ALTN, AUTO FAIL EXTINGUISHED. SYSTEM OPERATED NORMALLY IN ALTN. ACFT GROUNDED. COMPLISHED BITE CHECK OF NR 1 CPC. NO LOGGED FAULTS. R & R NR 1 CPC IAW AMM 21-31-01. ACCOMPLISHED PRESSURIZATION SYS GROUND TEST IAW AMM 21-31-00-700-802. NO DEFECTS NOTED.