As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERCOSTALS BETWEEN FS310 AND FS349 AT STR21L (3 TOTAL) ARE CORRODED (C-CHECK RO 6/11/2021) UPON FURTHER INVESTIGATION TWO INTERCOSTASL REQUIRE REPLACEMENT FROM FS 310- FS 349. REMOVED AND REPLACED 2 INTERCOSTALS AT FS 310- FS 333 AND FS 333- FS 349 IAW CRJ 200 SRM 51-42-06 AND 51-42-21.