What was found
SEVERAL AREAS OF CORROSION ON UPPER LT NOSE CHORD BS 312 TO 350, LBL 13 WL 169. WILL REQUIRE REMOVAL OF DOGHOUSE FLOOR, STIFFENER BRACKETS AND COOLING DUCT FOR ACCESS. REMOVED AND REPLACED LT NOSE CHORD BS 312 TO 350, LBL 13 WL 169, INSTALLED FASTENERS PER BAC DRAWING NR 65-18415.