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 310 TO 364 AT STGR 20RH OF THE MAIN AVIONICS COMPARTMENT (SM) "SUMMARY OF NRC 00284: INTERCOSTALS FS=310 TO FS=319, FS=319 TO FS=349 AND FS=349 TO FS=364 AT STGR 20RH WERE REPLACED PER CRJ/900 SRM 51-42-06-001-001-A01 AND 51-42-21-001-001-A01