As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT AT AN ALTITUDE OF 5,000 THE CABIN DIFFERENTIAL WENT TO .3 & THE CABIN ALTITUDE DESCENDED AT THE RATE OF DESCENT THAT THE ACFT WAS DESCENDING AT, LANDING WAS UNEVENTFUL. TROUBLE SHOT THE DISCREPANCY TO A FAULTY PRESSURIZATION CONTROL VLV. CONTROLLER VLV WAS REPLACED, A SUCCESSFUL OPERATIONS CHECK PERFORMED & THE ACFT WAS RETURNED TO SERVICE. .