As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN AT STATION 955 APPROXIMATELY RBL 80 - 90 OVER WING BOX AREA HAS CORROSION ON UPPER SURFACE. BLENDED OUT CORROSION & FOUND OUT OF SRM ALLOWABLE LIMITS. REPAIR ACCOMPLISHED IAW REO-G17363, REV D & ECRA 5710-02373. THIS IS A CAT A REPAIRED, NO FURTHER ACTION REQUIRED.