As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INITIAL INSPECTION: CORROSION ON [INTERCOSTAL] 26L AND 27(LH SIDE) BTW. FS349 AND FS364 (FWD TO E/E DOOR) AT MAIN AVIONICS COMPARTMENT [IN REFERENCE TASK 900-53-140-300 APPENDIX A]. (E/E)(TCI 100-09) SUMMARY: CORROSION LEVEL 2.INTERCOSTAL 27(LH SIDE) AND 26LH BTW. FS349 AND FS364, WERE REPLACED PER CRJ900 SRM 51-42-21-001-001-A01 AND 51-42-06-001-001-A01.