As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN AVIONICS BAY STR 21L BACK-UP SILL ATTACH ANGLE COMMON TO FS349.00 FRAME CORRODED (C-CHECK RO 5/3/2021) REPLACED FS349 STR 21L BACK UP SILL ATTACH ANGLE COMMON TO FRAME REF DWG SH670-31810 REV. Y AND CRJ900 SRM 51-42-06-001-001-A01. COMPLIED WITH 51-900-1002-SKY.