As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FS 621.00 PRESSURE BULKHEAD LT FLIGHT COMPARTMENT DISTRIBUTION CHECK VALVE, ONE FLAPPER ON CHECK VALVE WILL NOT CLOSE FULLY. C-CHECK RO 9/12/2020. REMOVED AND REPLACED THE LT PRESSURE BULKHEAD CHECK VALVE, REF CRJ200 AMM. LEAK CHECKS GOOD.