As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION ON INTERCOSTAL IN STA. FS= 349 TO FS= 364 BTW STGR 27 TO STGR 26RH AT MAIN AVIONICS COMPARTMENT. EVALUATED, DUE IT NOT ALLOW DAMAGE ON INTERCOSTAL IN STA. FS= 349 TO FS= 364 BTW STGR 27 TO STGR 26RH AT MAIN AVIONICS COMPARTMENT PER CRJ-900 SRM 53-21-23-101-003-A02 AND REPLACED PER CRJ-900 SRM 51-42-21-001-001-A01 AND SRM 51-42-06-001-001-A01.