What was found
CENTER WING BOX, INSPECTION OF REAR SPAR AND BOTTOM PANEL AT JUNCTION OF FUSELAGE, LT SIDE, HOLE "C" FOUND CRACK SIGNAL. COMPLIED WITH EA: 6-5710-T0357880 P1. TITLE: WINGS-BASIC WING STRUCTURE-CRACK HOLE C AT FR 47 LT SIDE DURING SB57-6086 EMBODIMENT. REPAIRED THE CENTER WING BOX REAR SPAR AND BOTTOM PANEL AT JUNCTION OF FUSELAGE, LT SIDE, HOLE "C" CRACK. THIS IS CATEGORY B REPAIR. FOLLOW UP INSPECTION, PER EA: 6-5710-T0357880. MAJOR REPAIR, IAW FEDEX GMM6-2-100.