As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CRUISING AT 31,000 FT WE EXPERIENCED, LOSS OF CABIN PRESSURE WHICH RESULTED IN THE CABIN RAPIDLY CLIMBING TO APPROXIMATELY 13100 FT. COMPLIED WITH THE QRH AND DESCENDED TO 10,000 FT. HAD LARGE AND RAPID FLUCTUATIONS IN THE RATE BUT THE CABIN CLIMBED STEADILY UP. F/A REPORTED HEARING A WOOSH SOUND IN THE CABIN [EMERGENCY DECLARED].