As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STA 1020 TO 1110, BTN L11" AND R11" FLR METAL PNL SKIN FOUND CORROSION. FLOOR PANEL REPAIRED AS PER RS R53-20-35251 AND EO B747-5320-21675-A AND THIS METAL PANEL NEED REPLACEMENT WITHIN 18 MONTHS OR 1000 CYCLES WHICHEVER OCCURS FIRST. CORROSION BLEND OUT DEPTH 0.004" WIDTH 1" LENGTH 4" WITHIN SRM 53-20-01 FIG 1 LIMITS.