What was found
LH WING / REAR SPAR / UPPER CAP / XORS 725, 745, 790 : CORROSION REPAIR THE LH WING REAR SPAR WAS FOUND CORRODED ON THE UPPER SURFACE OF THE UPPER CHORD AT XORS 725, 745, & 790 COMMON TO TRAILING EDGE PANEL ATTACH FASTENER LOCATIONS. AT THE XORS 725 LOCATION, THE CORROSION EXTENDED UNDER THE UPPER WING SKIN. THE SKIN WAS TRIMMED AWAY OVER A 2" X 2.5" AREA TO ACCESS THE CORROSION. ALL CORROSION AREAS WERE BLENDED AWAY AND THE SKIN REPAIRE WITH 2 ALUM DOUBLERS PER ER/A.