What was found
DURING HEAVY MAINTENANCE CENTER WING UPPER PANEL CORRODED AT RH APPROX STA. 1229, XCW 34.5 AT S-15. AFTER FURTHER EVALUATION, BOEING CERTIFIED THE BLENDED OUT AREA AS A PERMANENT REPAIR AND BEEN COMPLETED WITH ALL THE REQUESTED PROVISIONS AT R/H CENTER WING UPPER PANEL APPROX STA 1229, XCW 34.5 AT S-15 IAW MD-11 BOEING MESSAGE: WGN-WGN-25-0035-04C. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.