As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PAX DOOR AFT INTERCOSTAL DD3 HAS CORROSION (C-CHECK) RO 2/14/2020 PAX DOOR AFT INTERCOSTAL DD3 OUT OF LIMITS. REPLACED INTERCOSTAL REF CRJ900 SRM AND BOMBARDIER DRAWING. PRESSURE CHECK NOT REQUIRED DUE TO PASSENGER DOOR REPLACED ON CAMP#20407458.