Velodyne Subwoofer problem, how to repair Part 1

You have this very powerful subwoofer, you like it, it works just great, and one day, for no reason it stops working. What happened, it was working last time when you turned it off? The problem is the manufacturer used bad capacitors inside it and they lost the capacity. They are some in preamp section and some in power amp section. In these videos i am trying to explain you how to repair it.