As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A ROUTINE MAINT INSP THE UPPER RT OB WING SKIN TE WAS FOUND CORRODED WITH CRACKS COMING AROUND SEVERAL RIVETS. THE RT UPPER OB WING SKIN WAS REMOVED, ALL THE CORROSION WAS REMOVED, THE WING STRUCTURE INSPECTED, AND THE SKIN WAS REPLACED IAW THE SRM.