As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURE DIFF IS ABOVE LIMITS, DESCENDED FROM FL 390 TO 350. REMOVED AND REPLACED CPC NR 2 IAW AMM 21-31-01, OPS CHKD GOOD. INSPECTED BOTH PACK BAYS FOR LEAKS, NONE NOTED. INSPECTED OUTFLOW VALVE AND OVER PRESSURE VALVES. NO DEFECTS NOTED.