As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERCOSTAL AT STR 21L FS310 333 IS CORRODED. (C-CHECK) RO 6/8/2020 REMOVED AND REPLACED CORRODED INTERCOSTAL/BACK UP SILL WITH NEW ( P/N SH670-31822-1) AT STGR 21L BETWEEN FS310.00 AND FS333.00, REF DWG AND SRM. ALL CHECKS GOOD. SEE CONTINUATION CARD FOR FURTHER DETAILS. COMPLIED WITH TASK CARD.