As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION OVER STGR27 BTW FS280 / FS310 AT MAIN AVIONICS COMPARTMENT. REMOVED PER CRJ900 SRM 51-21-06-001-001-A01, EVALUATED,THEREFORE OUT OF LIMITS PER CRJ900 SRM 53-21-03-101-002-A04 AND REPLACED PER CRJ-900 SRM 51-42-06-001-001-A01 AND CRJ-900 SRM 51-42-21-001-001-A01.