What was found
DURING OP 16 MAINT CHECK, FOUND FUSELAGE CORROSION CLEAN UP BEYOND MANUAL LIMITS, 30 PERCENT REMOVED, AT FS 993, LONGERON 29L ON FUSELAGE SKIN. REPAIRED DAMAGED AREA BY BLENDING OUT AREA AND INSTALLING A DOUBLER PER SRM 53-04, FIG 38 PAGE 209, CONDITION 3.