What was found
MCN - DURING C18 CHECK DISCOVERED LOWER L1 SILL ATTACH BRACKET CRACKED, .5 INCHES IN LENGTH, AT BS 323, WL 207 AND BL 66L. MAINTENANCE REMOVED CRACKED BRACKET AND INSTALLED NEW BRACKET AT BS 323, WL 207 AND BL 66L IAW BOEING 737-300 SRM 51-40-02-00.