As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FUSELAGE SKIN WAS FOUND CORRODED ALONG THE AFT EDGE OF THE LAVATORY SERVICE CUTOUT AT FS 1582. THE CORROSION WAS REMOVED WITH A 5 X 4 INCH SKIN CUTOUT. THE CUTOUT WAS REPAIRED WITH AN EXTERNAL ALUMINUM DOUBLER AND TRIPLER INSTALLED PER ER/A 377820-14, REV A.