As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT WAS CLIMBING TO ALTITUDE PRESSURIZED WHEN PILOT HEARD BANG IN BACK OF CABIN. THE SMALL WINDOW AFT OF CABIN DOOR HAD CATASTROPHIC FAILURE AND AIRCRAFT DEPRESSURIZED. LOG BOOKS WERE NOT AVAILABLE FOR REVIEW. PILOT STATED HE BELIEVED THE WINDOW HAD NEVER BEEN REPLACED. THE OPPOSITE WINDOW WAS REPLACED AT THE SAME TIME AT THE PILOTS REQUEST.`