As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FINAL APPROACH, CABIN WAS AT-4990 ALTITUDE. CREW FOUND DEBRIS STUCK IN OUTFLOW VALVE ON THE POST FLIGHT WALK AROUND. MAINTENANCE REMOVED INSULATION DEBRIS FROM OUTFLOW VALVE AND CHECKED AREA FOR DAMAGE WITH NO DEFECTS NOTED. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 21-31-00.