As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION FOUND ON THE AREA JUST AFT OF THE LAV SERVICE PANEL. CORROSION AT BS 720, BETWEEN STRINGERS S27-29R. CORROSION WAS ALSO DISCOVERED ON BOTH SIDES OF THE LOWER AFT BREAK RING. THE CORROSION WAS REMOVED IAW ER/A 548800-14, INSTALLED A SKIN DOUBLER AND TRIPLER WITH A FILLER.