As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION FOUND ON LH STRG 21 AT APROX FS 320.00 (C-CHECK) RO 3/3/2020 BLENDED, INSPECTED AND DETERMINED TO BE OUT OF LIMITS, 100% MATERIAL LOSS. REMOVED AND REPLACED AFFECTED STRINGER SECTION BETWEEN FS 334 AND FS 358 AND ADDED A STRINGER SPLICE AT APPROX FS 351 TO FS 363, REF CRJ900 SRM. SEE CONTINUATION FOR DETAILS. COMPLIED WITH TASKCARD AND M-337