As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE COMPLYING WITH THE VISUAL INSPECTION OF THE UPPER WING SURFACE A BULGE WAS NOTICED JUST AFT OF THE AFT SPAR CAP AT APPROX STA 523 ON THE RIGHT WING. AFTER FURTHER CHECKING THE STOP SUPPORT FOR THE SPOILERS WAS FOUND TO BE CORRODED. THE PART WAS REPLACED PER BOEING SRM 51-30-2 AND 51-10-1.