As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OP 16 MAINT CHECK, FOUND SECTION OF STA 604 BULKHEAD TEE CHORD FROM O/B OF LONGERON 29L TO O/B OF 29R HAD CORROSION. REPLACED LOWER SECTION OF STA 604 TEE CHORD BECAUSE OF OUT OF LIMIT CORROSION BETWEEN L28L TO L28R PER ARA 16470.