As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB RECEIVED CABIN ALT CAUTION MESSAGE AT ABOUT 11,000 FT THEN RECEIVED CABIN ALT WARNING SOON AFTER. DESCENDED TO 8,000 FT PRESSURIZATION STABILIZED. AIRCRAFT REMOVED FROM SERVICE. FOUND OVERBD AND INBD EXHAUST VALVES DEACTIVATED INCORRECTLY. SECURED OVERBD EXHAUST TO CLOSED AND INBD VALVE TO OPEN IAW AMM 21-24-00, SUP 21-259A.