As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
* CORROSION DETECTED ON L/H-AFT EMER EXIT DOOR, AT (10EA) "NUTS" THAT ATTACH THE LATCH MECHANISM TO THE TOP INTERCOSTAL INSIDE THE DOOR (MARKED). (C-CHECK RO 5/25/2021) REMOVED AND REPLACED L/H-AFT EMER EXIT DOOR NUTS (10EA) THAT ATTACH THE LATCH MECHANISM TO THE TOP INTERCOSTAL INSIDE THE DOOR REF CRJ900 AMM 20-21-00-910-801-A01-A01 PGS 201-202, 298.18. TW# TUC8612 DUE 31OCT21.