What was found
DURING HEAVY MAINTENANCE UPPER PANEL CORRODED AT RH APPROX STA 1226, XCW 80.5 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 RH CENTER WING UPPER PANEL APPROX. STA 1226, XCW 80.5 AT S-15 IAW MD-11, BOEING MESSAGE: WGN-WGN-25-0035-04C. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.