As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"AWR HIDDEN DAMAGE: AFTER REMOVE INSULATION ON MAIN AVIONICS COMPARTMENT, CORROSION ON STGR 18R BTW FS280/310 WAS FOUND IN REF EO: R25120 (SM)[E/E]. "SUMMARY OF NRC 00365 CORROSION LEVEL 2:STGR 18R BTW FS280/310 WAS REPLACED PER CRJ-900 SRM 51-42-06-001-001-A01 AND CRJ-900 SRM 51-42-20-001-001-A01