As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT SIDE OF FRAME AT FS 319.70 AND STR 21L HAS HEAVY CORROSION. (C-CHECK) RO 4/24/2020 REMOVED CORROSION AND EVALUATED AT FS319.70, FOUND TO BE OUT OF LIMITS REF SRM. REMOVED AND INSTALLED NEW FRAME AT FS319.70 BETWEEN STR18L AND STR21L. REF SRM AND DWG. LEAK CHECK GOOD. COMPLIED WITH TASK CARD. SEE CONTINUATION CARD FOR DETAILS.