As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION ON LH INTERCOSTAL IN STA. FS= 349 TO FS= 364 NEAR STGR 27 AT MAIN AVIONICS COMPARTMENT INTERCOSTAL NO DAMAGE ALLOWED, PER CRJ-900 SRM 53-21-23-101-003-A02 THEREFORE WAS REPLACED PER CRJ900 SRM 51-42-06-001-001-A01 AND SRM 51-42-20-001-001-A01