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 2L, 2R, 6L AND 6R BTW FS 364-349 AT INTERNAL STRUCTURE OF MAIN AVIONICS COMPARTMENT (E/E) (SM)(TCI:100-09) IN REFERENCE NRC 000141 TASK 900-53-140-300 APPENDIX A ]. INTERCOSTALS 2L, 2R, 6L AND 6R BTW FS 364-349 AT INTERNAL STRUCTURE OF MAIN AVIONICS COMPARTMENT WERE REPLACED FOR A NEW ONES PER CRJ-900 SRM 51-42-06-001-001-A01 AND SRM 51-42-21-001-001-A01. LEVEL CORROSION 2