What was found
ON PREFLIGHT WALK AROUND, CREW NOTICED ONE RIVET HEAD BROKEN OFF ON THE RIGHT SIDE OF THE FUSELAGE, JUST BELOW THE F/O'S DV WINDOW, AT FRAME 9. INTERNAL INVESTIGATION REVEALED THE SKIN SUPPORT BRACKET AT THAT LOCATION TO BE CRACKED. THE BRACKET WAS REPLACED PER AERODESIGN REPORT NR 660-1, IR DATED 2-16-93.