What was found
***CORROSION*** NOTED ON ACB INTERCOSTAL (BS 747 - BS 767 / BETWEEN S-25R AND S-26R). / MULTIPLE CORROSION AREAS UNDER THE NUTPLATES ON THE INTERCOSTAL (BAFFLE) FROM BS 747 - BS 767 RBL 21 BETWEEN STR 25R - 26R FOUND TO BE OUT OF LIMITS DUE TO NO SRM ALLOWABLE DAMAGE. THE STRUCTURAL ITEM NEED TO BE REPAIR BY REPLACEMENT IAW SRM 51-10-02 PAR 9.C. REMOVED AND REPLACED INTERCOSTAL (BAFFLE) FROM BS 747 - BS 767 RBL 21 BETWEEN STR 25R - 26R; P/N # 146A7505-8; PO# 698532 IAW DWG# 146A7502.