As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO INOP LIGHT ILLUMINATED WITH CABIN ALTITUDE, DEPLOYED PASSENGER OXYGEN MASKS. BITE CHECKED BOTH CABIN PRESSURE CONTROLLERS NR 1 FAULTS AC PWER LOSS REPLACED SAME. REPLACED UPPER POS PRESSURE RELIEF VALVE. PERFORMED O2 MASK DROP TEST INCLUDING ALT SWITCH IAW AMM 35-21. TESTED GOOD.