As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DDURING HEAVY MAINTENANCE CHECK CENTER SECTION UPPER PANEL CORRODED AT RH APPROX STA 1204, XCW 24.5 S-18. AFTER FURTHER EVALUATION BOEING CERTIFIED THE BLENDED OUT AREA AS A PERMANENT REPAIR AND BEEN COMPLETED WITH ALL THE REQUESTED PROVISIONS AT RH APPROX. STA 1204, XCW 24.5 S-18 ON CENTER WING UPPER PANEL IAW MESSAGE: WGN-25-0035-04C. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.