As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LOSS OF CABIN PRESSURE AND DECLARED EMERGENCY. PERFORMED EMERGENCY DESCENT. DEPLOYED OXYGEN MASKS. UPPER POSITIVE PRESSURE RELIEF VALVE POPPED OPEN. FOUND UPPER AND LOWER POSITIVE PRESSURE VALVE FAILED. R & R UPPER AND LOWER PRESSURE VALVES. ALSO, REPLACED OUTFLOW VALVE AS A PRECAUTION. OPS CHECKED GOOD.