As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERCOSTAL 21L BETWEEN FS310 AND FS333 HAS EXFOLIATED CORROSION AROUND A FASTENER HOLES AND REQUIRES A REPLACEMENT (C-CHECK RO 8/16/2021) REMOVED AND REPLACED INTERCOSTAL IN FWD CABIN BETWEEN FS310.00 TO FS333.00 STRINGER21L IAW CRJ 700 SRM 51-42-06-001-001-A01 / 51-42-21-001-001-A01 AND DRAWING #SH670-31810 REV AE. ( SEE CONTINUATION SHEET FOR FURTHER DETAILS). COMPLIED WITH TASK CARD 51-900-1002-SKY.