What was found
MCN - DURING C11 CHECK DISCOVERED CORROSION ON THE LT EMERGENCY EXIT LOWER SILL INNER CHORD AT BS 1323 AND BS 1343 BL 64L, WL 208. MAINTENANCE REMOVED CORROSION ON THE LT EMERGENCY EXIT LOWER SILL INNER CHORD AT BS 1323 AND BS 1343 BL 64L, WL 208 IAW BOEING 757-200 AMM 51-00-53-0 FIG 203. CORROSION FOUND OUT OF SRM LIMITS. INSTALLED NEW INNER CHORD AT BS 1323 AND BS 1343 BL 64L, WL 208 IAW BOEING 757-200 SRM 51-40-02-OG, FIGS 3, 8.