As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN AVIONICS BAY FS319.70 FRAME FROM STR 18L TO STR 21L CORRODED (C-CHECK RO 5/3/2021) REPLACED FRAME AT FS319.00, STRINGER 18L - 21L PER SRM 51-42-06-001-001-A01, SRM 51-42-21-001-001-A01 & DRAWING SH670-31810 REV AE. SEE CONTINUATION CARD FOR DETAILS. CHECKS GOOD. COMPLIED WITH TASK CARD 51-900-1002-SKY.