What was found
DURING HEAVY MAINTENENACE CHECK CENTER WING UPPER PANEL CORRDODED AT LH APPROX STA 1205, XCW 7.0 S-18. AFTER FURTHER EVALUATION OF BLENDED OUT AREA AT LH APPROX STA 1205, XCW 7.0AT S-18, BOEING FOUND BLENDED OUT LOCATION ACCEPTABLE AS A PERMANENT REPAIR IAW MD-11, MESSAGE: WGN-WGN-25-0035-4C. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.