As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-CHECK FOUND THE PASSENGER DOOR LOWER CORNER CORRODED ON THE INTERNAL SURFACE. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE PASSENGER DOOR LOWER CORNER IAW CRJ SRM 51-42-06 AND 51-42-21. THE AIRCRAFT WAS RETURNED TO SERVICE.