As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERCOSTAL AT FS 404.0 AND RBL 1.5 IN AVIONICS CRAWL WAY AFT OF MAIN AVIONICS DOOR HAS SURFACE CORROSION ON SIDE OF INTERCOSTAL, BEYOND LIMITS. FOUND DURING C-CHECK INSPECTION, NDT-ET CONDUCTIVITY CARRIED OUT AND FOUND MATERIAL TO BE 30.20 PERCENT IACS. INTERCOSTAL REMOVED AND REPLACED IAW CRJ SRM 51-23-00 AND 51-42-06 AND 51-40-11.