What was found
EXISTING AFT FUSELAGE BELLY DOUBLER, BETWEEN BS 1701 TO 1720, JUST AFT OF AFT LAVATORY SERVICE PAN, HAS ONLY 2 ROWS OF FASTENERS AT THE BS 1720 CIRCUMFERENTIAL BUTT SPLICE. THIS REPAIR HAS NO HISTORY IN AMIS & REQUIRES VALIDATION TO THE SRM. REMOVED EXISTING DOUBLER, FOUND ADDITIONAL CORROSION ON BS 1701 FRAME, AFT BULKHEAD FWD & AFT CHORDS, & SKIN. REMOVED CORROSION & ACCOMPLISHED NDT OF FASTENER HOLES & SKIN CUT OUT.