As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PAX DOOR MID DD4 INTERCOSTAL HAS CORROSION. C-CHECK RO 1/5/2021. REMOVED AND INSTALLED NEW MID DD4 INTERCOSTAL, IAW CRJ 700 SRM 51-42-06-001-001-A01 AND CRJ 700 SRM 51-42-21-001-001-A01 AND BOMBARDIER DWG 601R31702 REV N. NO LEAKS NOTED. COMPLIED WITH 51-900-1002-SKY.