As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FRAME AT FS 349.00 CORRODED BETWEEN STGR 26L TO 27L. C-CHECK RO 9/5/2020. REMOVED DAMAGED FRAME AT FS 349.00 AND INSTALLED A NEW FRAME, IAW CRJ 200 SRM AND DRAWING NUMBER FOR FASTENER CALL OUT AS DOCUMENTED ON ATTACHED CONTINUATION CARD. PRESSURIZATION AND OPS CHECKS ALL PASSED. M-337 AND TASK CARD COMPLETED WITH NO CHANGE TO WEIGHT AND BALANCE.