As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL430 CREW RECEIVED A "CABIN DIFFERENTIAL PRESSURE WARNING" REQUIRING AN EMERGENCY DESCENT. CABIN DID NOT REACH AN UNSAFE ALTITUDE AND EMERGENCY OXYGEN MASKS DID NOT DROP. MAINTENANCE DETERMINED CABIN PRESSURIZATION SELECTOR / CONTROLLER FAILED. AS A PRECAUTION THE CABIN PRESSURE TRANSDUCER P/N 2100136-1-10 WAS REPLACED DURING THIS MAINTENANCE EVENT.