As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"INITIAL INSPECTION: CORROSION ON STGR 21RH BTW FS=333 / FS=379 AT INTERNAL STRUCTURE OF MAIN AVIONICS COMPARTMENT (SM) (E/E) (TCI:53-20-305) ""SUMMARY OF NRC:00280 CORROSION LEVEL:2 ON STGR 21RH BTW FS=333 / FS=379 AT INTERNAL STRUCTURE OF MAIN AVIONICS COMPARTMENT, STRINGER 21 RH FS=333 / FS=379 WAS REPLACED PER CRJ-900 SRM 51-42-06-001-001-A01. "