As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 3407, CREW REPORTED LOSS OF PRESSURIZATION AND DECLARED EMERGENCY AND LANDED AT DESTINATION WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED THE DIGITAL CONTROLLER. MANUAL AND AUTO OPC GOOD RAR ELECTRO PNEUMATIC OUTFLOW VALVE OPC GOOD AMM 21-31-00-103 THE AIRCRAFT WAS RETURNED TO SERVICE.