As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY MX PERFORMING INSP IT WAS NOTED THAT THE INTERCOSTAL AT STA 950A IS CORRODED AT STRINGER 28L. REMOVED INTERCOSTAL AND FABRICATED NEW FROM 7075 T6 .040" 20" X 8" INSTALLED INTERCOSTAL, NO OTHER DEFECTS WERE NOTED. ACFT WAS RETURNED TO SERVICE.