As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROX 8-10 MINUTES INTO FLIGHT, HEARD A LOUD "POP" COME FROM THE REAR OF THE ACFT. FELT DISCOMFORT IN OUR EARS, LOOKED AT THE PRESSURIZATION GUAGES AND NOTICED THE CABIN VSI WAS CLIMBING OVER 6000 FPM AND THE CABIN ALTITUDE WAS CLIMBING RAPIDLY. ALL OXYGEN MASKS WERE DEPLOYED AND DONNED FOLLOWING MWS ANNUNCIATOR INDICATIONS AND WARNING HORN. CHECKLIST " RAPID DEPRESSURIZATION" AND EMERGENCY DESCENT PERFORMED. (K)