As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STA 1170 TO 1250, BTN L11 AND R11 FLR METAL PNL SKIN FOUND CORR. METAL 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 0.040 INCH WIDTH 2 INCHES LENGTH 5 INCH OUT OF SRM 53-10-01 FIG 1 LIMIT.