As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: UPON REMOVAL OF AFT BULKHEAD LOWER SEAL FOUND CORROSION AT AFT PRESSURE BULKHEAD LOWER INTERCOSTAL ATTACHMENT. REMOVED CORROSION BY MECHANICAL MEANS AND OUT OF SRM LIMITS. FABRICATED INTERCOSTAL PER BOEING AND REPLACED.