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 INTERCOSTAL AT BS 950E +6 IS CORRODED ON THE FWD SIDE BETWEEN STR 30-27R. REMOVED DAMAGED INTERCOSTAL, FABRICATED NEW FROM 7075-0 DIM. 27 INCHES X 8 INCHES .040 INCH HEAT TREATED TO T6. INSTALLED REPAIR, NO OTHER DEFECTS WERE NOTED. ACFT WAS RETURNED TO SERVICE.