As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT PRESSURIZATION TOO LOW ON FINAL APPROACH, RESULTING IN RAPID PRESSURE CHANGE AFTER TOUCHDOWN (VERY RAPID--6800FPM). AIRCRAFT WAS GROUNDED. MAINTENANCE FOUND OUTFLOW VALVE 10HL BLOCKED AND REPLACED OUTFLOW VALVE PER MM 21-31-51.