As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERGRANULAR CORROSION ON THE AFT END OF STRINGER SPLICE ON STR 21R AT FS333. (C-CHECK) RO 5/16/2020 REMOVED AND REPLACED CORRODED STRINGER SPLICE ON STRG 21R AT FS333 REF CRJ900 SRM AND DWG. SEE CONTINUATION CARD FOR DETAILS. CHECKS OKAY