As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND CORROSION ON PAX DOOR INTERCOSTAL,DD2 PART # 601R318053-3. (C-CHECK RO 8/18/2021) CORRROSION FOUND TO BE OUT OF LIMITS. REPLACED PAX DOOR INTERCOSTAL DD2 REF CRJ-900 SRM 51-42-06-001-001-A01 AND CRJ-900 SRM 51-42-21-001-001-A01 AND DWG: 601R31702 REV N. COMPLIED WITH TASK CARD 51-900-1002-SKY. LEAK CHECK GOOD