As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION ON BACKUP SILL STGR 21L FROM FS310.00 TO FS333.00. REMOVED AND REPLACED BACKUP SILL AT STGR 21L BETWEEN FS310 AND FS333. REF. CRJ900 SRM 51-42-06-001-001-A01 AND DWG SH670-31810 SHEET 9 REV. AE. COMPLIED WITH SKYWEST TASK CARD 51-900-1002-SKY.