As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PROVIDING ACCESS ON JOB 915069104 OP # 107 MX TRANS # 20680283 CORROSION WAS FOUND AT THE BASE OF THE F.S.319.00 FRAME AT STR-21L. (C-CHECK) RO 4/23/2020 REMOVED AND REPLACED FRAME FS 319 STR 20L - 23L REF CRJ 900 SRM AND BOMBARDIER DWG CW WITH FORM M-337