I have an American Standard Americast bathtub that I purchased several years ago at Loweâ€™s when I was remodeling a kitchen and bathroom at my house, and that I finally had installed in another bathroom during a remodeling project last summer. I noticed after the tub was installed that the tub floor had a section that looked irregular. After a couple months of bathtub use, the irregular-appearing area developed into a significant depression that holds water. Has anyone here encountered this problem? Is anyone here aware of any recalls on Americast bathtubs?