As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CPCP CHECK INSPECTION, FOUND LEVEL 2 CORROSION: BS 1241 A/C BAY ACCESS RT SIDE LOWER CHORD CORRODED. REMOVED AND REPLACED BS 1241 A/C BAY ACCESS RT SIDE LOWER CHORD IAW B747 SRM 51-10-1 AND 51-30-02. CORROSION TASK CARD NUMBER C53-100-01. NON-ROUTINE TASK CARD NUMBER 107499.