What was found
DURING C-12 CHECK THE FORWARD CARGO DOOR FORWARD LOWER SKIN WAS FOUND CHAFED ON INSIDE OF DOOR BS 445, STR 19 RT. MAINTENANCE BLENDED OUT CHAFED AREA AND FOUND SKIN TO BE CRACKED OUT OF LIMITS; REMOVED DAMAGED AREA OF FORWARD CARGO DOOR INNER SKIN BS 445, STR 19 RT; FABRICATED A REPAIR DOUBLER AND FILLER; INSTALLED REPAIR PARTS IAW B737-300 SRM 51-70-13, PG. 1-3, FIG. 1.