As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JUST AFTER STARTING A DESCENT FROM FL 410 CABIN RAPIDLY OVERPRESSURIZED . PRESSURE WENT TO BELOW ZERO AND CABIN DPSI WAS RIGHT AT REDLINE. DUE TO RATE AND PRESSURE, CHOSE TO CABIN DUMP. AS A RESULT OXYGEN MASKS DEPLOYED. OPS CHECKED PRESSURISATION SYSTEM ON GROUND WITH APU AND ENGINES, NO FAULTS FOUND.