As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON LEVEL OFF FL360 CABIN PRESSURE RATE SHOWED 2500FPM CLIMB. CABIN ALTITUDE APPROACHED 10000FT. IMMEDIATE DESCENT COORDINATED WITH ATC. OUTFLOW VALVE FULL CLOSED LT DUCT PRESSURE 12 PSI, RT 4 PSI....(CONT ON L/P-8524821) REF L/P'S 4446789, 4446790, 4446791 AND 8524821 FOR CORRECTIVE ACTIONS AND MX ACCOMPLISHED FOR THIS DISCREPANCY.