As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION ON INTERCOSTAL ATTACHED TO STRINGER 20RH IN STA. FS= 333 TO FS= 349 AT MAIN AVIONICS COMPARTMENT. (E/E). INTERCOSTAL ATTACHED TO STRINGER 20RH IN STA. FS= 333 TO FS= 349 AT MAIN AVIONICS COMPARTMENT. (E/E) WAS EVALUATED OUT OF LIMITS PER CRJ-900 SRM 53-21-23-101-002-A02 AND REPLACED PER CRJ-900 SRM 51-42-06-001-001-A01 AND CRJ-900 SRM 51-42-21-001-001-A01