As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT DURING DESCENT FROM FL320 TO FL240 CABIN ALTITUDE STARTED INCREASING. THE CREW DECLARED AN EMERGENCY AND INCREASED THERE DESCENT RATE. THE AIRCRAFT LANDED KCLT WITHOUT INCIDENT. MAINTENANCE FOUND THE MANUAL PRESSURIZATION MODE TO BE OPERATIONAL AND DEFERRED THE AUTO PRESSURIZATION MODE. SDF MAINTENANCE REPLACED THE ELECTRO PNEUMATIC VALVE AND OPERATIONAL CHECK WERE GOOD WITH NO FURTHER DEFECTS NOTED.