What was found
STRINGER 9L AT STA 439 IS CRACKED. REMOVED STR 9L AL STA 439 AND STRINGER CLIP AT STA 418 ON S-9L FOR ACCESS IAW: SRM 51-40-02. ROUTED AND RECEIVED FROM FAB SHOP, REPAIR STRINGER TRAV NR T10/843350. LOCATED AND DRILLED REPAIR STRINGER 9L AT STA 439 AND STRINGER CLIP AT 9L STA 418, IAW SRM 51-40-05. INSTALLED REPAIR STRINGER AT 9L STA 418, IAW SRM 51-40-02, STRINGER PN FX -141N3370-17-N00720. MAJOR REPAIR.