As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERCOSTAL AT STRINGER 20R, BETWEEN BS 310 AND 319 HAD CORROSION AT MULTIPLE LOCATIONS. THE INTERCOSTAL IS EXFOLIATED 100%, ORIGINAL MATERIAL THICKNESS IS .063" AND FOUND TO BE OUT OF LIMITS IAW SRM. REMOVED AND REPLACED THE INTERCOSTAL IAW DWG, AND SRM.