As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERCOSTAL BETWEEN FS394 AND FS409 BETWEEN STGR26L AND STGR27 IS CORRODED. REPLACED INTERCOSTAL FROM FS394 AND FS409 BETWEEN STGR 26L AND STGR 27 P/N: SH670-32075-4. IAW CRJ900 SRM 51-42-06-001-001-A01 AND CRJ900 SRM 51-42-21-001-001-A01.