As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE GETTING ACCESS TO PAX DOOR HINGE FOUND CORROSION ON INNER SKIN AT 4EA LOCATIONS BETWEEN TOP FLANGE OF INTERCOSTALS AND INNER SKIN MATING SURFACE. (C-CHECK) RO 3/13/2020 REMOVED AND INSTALLED NEW INNER SKIN ON THE PAX DOOR REF BOMBARDIER DWG, AND CRJ-200 SRM.