As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4306, CREW REPORTED WHILE CLIMBING THRU 19000 THEY RECEIVED CABIN ALT WARNING AND AURAL WARN. CREW REQUESTED EMERGENCY DESCENT TO 10000 AND RETURNED TO CVG. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED DIGITAL PRESSURIZATION CONTROLLER IAW AMM 21-31-01. OPERATIONAL CHECKED GOOD. NO FURTHER FAULTS FOUND AT THIS TIME. AIRCRAFT RETURNED TO SERVICE.