What was found
Improper Fastener on lap Seam at STA. 615 and S-47R on Fuselage below FWD. Lower Cargo Compt. CORRECTIVE ACTION: Removed fastener and existing doubler, cut overlapping skin, requested NDT, fabricated, alondined, primed and installed -1 repair doubler and -2 filler per B-747 SRM, Ch.53-30-03, Fig.17, & SOPM Ch. 20-41-02, Pg. 17-19. Category "B" Repair COI# 53I initiated.