What was found
DURING HEAVY MAINTENANCE UPPER PANEL CORRODED AT RH APPROX STA 1229, XCW 34.5 AT S-15. AFTER FURHTER EVALUATION, BOEING CERTIFIED THE BLENDED OUT AREA AS A PERMANENT REPAIR AND BEEN COMPLETE WITH ALL THE REQUESTED PROVISIONS AT RH 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.