As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING MODIFICATIONS AROUND THE AFT LAV SERVICE PANEL CUTOUT IN THE SKIN, THE BONDED INTERNAL DOUBLER WAS TORN IN SEVERAL LOCATIONS. THE SKIN AND BONDED DOUBLER WERE CUTOUT AND REMOVED BETWEEN FS 1158 AND 1183 AND BETWEEN STR 20L AND 23L. A NEW SECTION OF SKIN WAS SPLICED IN PER ER/A 363813-14, REV B.