As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 250, CABIN ALTITUDE AT ABOUT 5500 FT. CABIN PSI WAS AT 6.1. CABIN STARTED TO CLIMB AT A RAPID RATE. NO POP OR BANG, JUST A LOUD AIR RUSHING SOUND THAT BEGIN SIMULTANEOUSLY WITH THE CABIN CLIMB. OUR DECENT WAS ABOUT 5000 FPM. DESCENDED WITHOUT FURTHER INCIDENT TO 3000 FT. LANDED WITHOUT FURTHER INCIDENT. FOUND DOOR OUT OF RIG.