I went to uncover and clean up my Hunter 170 for spring and found the just inside the rub rail there is a crack about 10 feet long along the side of the hull. The plastic is suprisingly thin along this spot and the crack is clean through. The plastic has pulled apart and is separated about a quarter of an inch. In a couple of areas there are parallel cracks and a section of plastic about half an inch wide has separated and is hanging lose. The hull hasn't been hit or subject to external stress. It was sitting covered and unstrapped. My hull is three years old with a 5 year warantee that calls for Hunter to repair or replace. My question is whether, if it comes up, should I consider repair an option?