As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERCOSTAL AT STGR 20R SHOWING CORROSION. (C-CHECK RO 8/19/2021) REMOVED AND REPLACED CORRODED INTERCOSTAL/SILL AT STR20R BETWEEN FS310-FS349 IAW CRJ700 SRM 51-40-11, 51-42-06, 51-21-11, 51-25-16. NO FURTHER ACTION REQUIRED AT THIS TIME.