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 REAR SPAR UPPER CHORD FOUND CORRODED AT WS 400 W/W AREA. CORROSION BLEND OUT 0.420" X 3" X 6" EXCEED SRM 57-10-01 FIG 1 LIMITS. RIGHT WING REAR SPAR UPPER CHORD AT WS 400 AREA REPAIRED AS PER HX RS R57-22-35684 AND UPS EO B747-5710-25565.