The squeal at the end of the spin cycle is normal on all Performa and Atlantis machines. What makes the sound is a very clean, shiny brake stator coming into contact with the brake rotor. Much like a car, the brakes tend to squeal after a few years. Unless you want to invest in some pretty expensive tools, don't worry about the noise...it will not affect the machine.
The solution to fixing this noise involves dropping the thrust bearing and brake assembly and simply sanding the shine off the stator. No big deal, unless you don't have the tool.