As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DD3 INTERCOSTAL P/N 601R318056-1 HAS CORROSION ON VERTICAL FLANGE (MARKED) (C-CHECK RO 6/22/2021) REMOVED AND REPLACED PAX DOOR DD3 INTERCOSTAL. REF CRJ900 SRM 51-42-06-001-001-A01 AND DWG 601R31702 REV N. COMPLIED WITH TASK CARD 51-900-1002-SKY. NO LEAKS NOTED.