As far as I know PB pipes, inside the house, were ALWAYS grey. The black lines were usually ABS and were used in mobile homes. After 1996, most installations were "manifold" type with small lines to the various faucets. These systems seldom had problems. The piping covered by the class action suit, now expired, was installed prior to 1996. There is no way to tell if you will EVER have a problem, so I would not do anything until it happened.