As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN AVIONICS BAY STR 21R CORRODED BETWEEN FS364.00 AND FS379.00 (C-CHECK RO 7/28/2021) REPLACED MAIN AVIONICS BAY STR 21R FROM FS333 TO FS379 REF CRJ900 SRM 51-42-06-001-001-A01 AND DWG SH690-31350 REV. M. CHECKS GOOD. COMPLIED WITH 51-900-1002-SKY.