As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURE LOSS, RTFL. REPLACED EQ COOLING OVERBOARD EXHAUST VALVE. NEW VALVE BAD FROM STOCK, ROBBED VALVE FROM KNOWN GOOD AC STILL FAILED, NEEDS MORE T-S. FOUND DUCT CONNECTED TO EXHAUST VALVE CRUSHED. REPLACED DUCT. A/C OKAY FOR SERVICE.