As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION FOUND ON STRINGER 21R BETWEEN FS 310 AND FS 333. C-CHECK RO 12/26/2020. REMOVED AND REPLACED STRINGER 21R BETWEEN FS 310 AND FS 333, REF CRJ900 SRM DWG. COMPLIED WITH SKYWEST TASK CARD. COMPLETED FORM M-337. NO LEAKS NOTED. SEE CONTINUATION CARD FOR DETAILS.