What was found
MCN - DURING C18 CHECK DISCOVERED VERTICAL CHORD CRACKED IN WEB AT BS 178, WL 230, BL 17.1R. MAINTENANCE CUTOUT DAMAGED SECTION OF WEB AT BULKHEAD 178 IAW BOEING 737-300 SRM 53-10-08-2R. FABRICATED WEB IAW BOEING 737-300 SRM 53-10-08-2R. INSTALLED FABRICATED REPAIR PARTS AT BS 178, WL 230, BL 17.1R IAW BOEING 737-300 SRM 53-10-08-2R.