House built on slab has 1.25 inch copper drain pipe that may be crushed or undersized, causing washer and dishwasher to back up into sink, and no camera can navigate the tight 90-degree turns to inspe

House built on slab has 1.25 inch copper drain pipe that may be crushed or undersized, causing washer and dishwasher to back up into sink, and no camera can navigate the tight 90-degree turns to inspect.