As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:C RIGHT WING WS 402 CORROSION REVEAL AT MATTING SURFACE BETWEEN CHORD AND EXTENSION SKIN (DEFECT FOUND AFTER EXTENSION SKIN LIFT UP) FOR CHORD REPAIR. CORROSION BLEND OUT 0.124" X 2" X 2" & 0.137" X 1.5" X 6" EXCEED SRM 57-30-01 FIG 1 LIMITS, RIGHT WING WS 402 & WS 424 UPPER SKIN BLEND OUT AREA REPAIRED AS PER HX RS R57-22-35684 ITEM C AND UPS EO B747-5710-25565.