As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CPCP INSPECTION FOUND LEVEL 2 CORROSION. CORROSION ON INTERCOSTAL WEB AFT OF BS 1700 AT S-30L. CORROSION OUT OF LIMITS IAW B747 SRM 53-10-1. INSTALLED REPAIR IAW B747 SRM 51-40-2. CORROSION TASK CARD NUMBER C53-110-01 PART 3 OF 5. NON-ROUTINE TASK CARD NUMBER 12579.