As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT STOPPED PRESSURIZING AFTER 10,000 FT. AND CABIN PRESSURE WAS LOST. CABIN PASSENGER OXYGEN MASKS DEPLOYED. EMERGENCY DECLARED. LANDING WAS UNEVENTFUL. MAINTENANCE WAS UNABLE TO DUPLICATE THE DISCREPANCY AFTER PERFORMING SEVERAL OPERATIONAL CHECKS WITH TEXTRON. THE OXYGEN MASKS WERE STOWED AND AN UNSUCCESSFUL OPERATIONAL CHECK FLIGHT WAS PERFORMED. MAINTENANCE REPLACED THE PRESSURIZATION CONTROLLER. AIRCRAFT WAS RELEASED FOR ANOTHER OPERATIONAL CHECK FLIGHT AND IS PENDING.