As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION WAS FOUND AT THE AFT LAVATORY SERVICE PANEL AT APPROXIMATELY STA 1681, S-26R TO S-29R. CORROSION WAS FOUND ON THE SKIN COMMON TO THE AREA UNDERNEATH THE LAVATORY SERVICE PAN ON THE FORWARD EDGE OF THE CUTOUT. REFERENCE ERA 552662-14 REV B FOR REPAIR.