As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PERIODIC CHECK, THE WING CENTER SECTION REAR SPAR VERTICAL STIFFENER AT LBL 86 WAS FOUND CORRODED. DISCREPANT STIFFENER P/N 65B10671-1 IS MADE FROM BAC 1517-1672 EXTRUSION AND MATERIAL IS 7178-T6511 ALUMINUM. MADE REPAIR PER EA 66-97876.