As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4050, CREW REPORTED THAT AT 34,000 FT CABIN ALTITIUDE WAS AT 300 FT AND RISING QUICKLY WITH A DIFFENTAL PRESSURE OF 6.8 PSI. PRESSURE STABILIZED AT A CABIN ALTITUDE OF APPROXIMATELY 12,700FT AFTER A RAPID DESCENT TO 10K. DECLARED AN EMERGENCY AND DIVERTED. AIRCRAFT LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. PERFORMED OPS CHECK IAW AMM 21-31-00 AND OPS CHECK OF PRESSURIZATION CONTROL SYSTEM. OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.