As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU INFLIGHT STI TO JFK - CREW REPORTED UNABLE TO PRESSURIZE AIRCRAFT AT 14000. CABIN CLIMBS 1500 PER MINUTES WITH OUTFLOW VALVES CLOSED. LANDED SJU WITHOUT INCIDENT. FOUND BROKEN HINGE AT CHECK VALVE FLAPPER. REPLACED BROKEN GROUND PRESSURE CHECK VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION.