As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2504 - EWR - FLIGHT CREW REPORTED CABIN RATE WOULD NOT CLIMB/DESCEND FROM 200 TO 1500 FT PER MIN IN CRUISE. CABIN ALTITUDE CLIMBED UP TO 8500 FT IN CRUISE. EWR MX PERFORMED VISUAL INSPECTION OF STATIC PORTS AND PERFORMED PRESSURIZATION TEST OF THE ACFT SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.