What was found
MCN - C13 CK - "C" - CRACK FOUND IN FUSELAGE SKIN, .280" LONG, AT BS 500B, BETWEEN STR 15R & 16R, AT THE FWD UPPER EDGE OF THE R/H WING ICE LIGHT CUTOUT. MAINTENANCE ROUTED OUT THE CRACK, FABRICATED REPAIR DOUBLER AND INSTALLED IAW AWA ER 15-5313-01305-TB2.