As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN AVIONICS BAY STR 20R INTERCOSTAL CORRODED BETWEEN FS310.00 AND FS319.70 (C-CHECK RO 7/28/2021) REPLACED INTERCOSTAL AT STRINGER 20R FROM FS310.00-319.70 PER SRM 51-42-06-001-001-A01, SRM 51-42-21-001-001-A01 & DRAWING SH670-31950 REV Y. SEE CONTINUATION CARD FOR DETAILS. CHECKS GOOD. COMPLIED WITH TASK CARD 51-900-1002-SKY.