What was found
MCN - MAJOR REPAIR - DURING C-16 CHECK CORROSION WAS FOUND ON LOWER SECTION OF INNER SKIN ON AFT CARGO DOOR 18" FROM FORWARD EDGE AT INSULATION BLANKET RETAINER SNAP BS 815, STR 23 R/H. MAINTENANCE CUTOUT CORRODED SECTION OF SKIN, FABRICATED A REPAIR DOUBLER AND FILLER, AND INSTALLED REPAIR PARTS IAW B737-300 SRM 51-70-13, PG. 1-5, FIG. 1.