As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURIZATION ELECTRONIC SYS IN STANDBY, CABIN PRESSURE CANNOT BE MAINTAINED (CABIN ALTITUDE RISES) IN CRUISE. NOT OK IN MANUAL. FOUND FAILED PRECOOLER VALVE AND CRACK IN THE FORWARD CARGO DOOR (FWD RT LOWER CORNER JUST UNDER DOOR PLATE). REPLACED PRECOOLER VALVE AND REPAIRED THE DOOR SILL PLATE LEAK. NO FAULT FOUND.