As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DECLARED EMERGENCY, AIRCRAFT EXPERIENCED A MILD DEPRESSURIZATION AT 31,000 FEET NOTICED BY ALT. WARNING HORN GOING OFF. CABIN PRESSURE REACHED 10,00 FEET WENT TO STANDBY AND THEN MANUAL TO CONTROL CABIN. DESCENDED TO 14,000 WHERE STANDBY WORKED. REMOVED AND REPLACED AFT CARGO DOOR SEAL PER MM.