As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2398 - EWR - FLIGHT CREW REPORTED PRESSURIZATION DIFFERENTIAL READS ABOUT 1-2 PSI LOWER THAN IT SHOULD AT ALL ALTITUDES - FL350- 5.9 PSI. EWR MX REMOVED AND REPLACED DIGITAL AND MANUAL PRESSURIZATION CONTROLLERS. EWR MX PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE. SDR # C2XA11RI084 REPORTS MANUAL CONTROLLER AND SDR# C2XA11RI085 REPORTS DIGITAL CONTROLLER.