As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PAX DOOR AFT SIDE INTERCOSTAL DD4 FOUND TO BE CORRODED. REMOVED AFT INTERCOSTAL DD4 IAW CRJ900 SRM 51-42-06-001-001-A01. LOCATED DRILLED AND INSTALLED NEW AFT INTERCOSTAL DD4 P/N: 601R31902-317A IAW CRJ900 SRM 51-40-11-001-001-A01 AND 51-42-06-001-001-A01