What was found
MCN - FOUND CORROSION ON R4 DOORWAY LOWER SILL INNER CHORD (SUPPORT), BS 1640 - BS 1661, RBL 57, WL 208. REPLACED CORROSION ON R4 DOORWAY LOWER SILL INNER CHORD (SUPPORT), BS 1640 - BS 1661, RBL 57, WL 208 IAW B757-200 SRM 51-40-02 FIGURE 12.