As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4023 THE CREW REPORTED THEY LOST CABIN PRESSURE GRADUALLY AT FLIGHT LEVEL 330, CABIN PRESSURE WENT 12000. THE CREW DECLARED AN EMERGECNY AND LANDED WITHOUT INCIDENT THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE DIGITAL CONTROLLER PER EMB-145 MM 21-31-01. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.