As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN ALT AUTO. UNABLE TO BRING CABIN DOWN MANUALLY, GRADUAL DECOMPRESSION OF CABIN. PERFORMED CABIN PRESSURE CONTROL TEST ON CPCS-A AND CPCS-B. BOTH PASSED AND PERFORMED CABIN PRESSURE CONTROL SYSTEM CABIN PRESSURIZATION GROUND TEST. NO LEAKS FOUND IAW AMM 21-31-00.