Months ago, I got this broken Aeroccino milk frother for free. This week I fiddled with it for a few hours, and got it to work:
… and this is how you get it apart. First carefully pull out the button on the front:
And then remove the rubber plugs to get to the screws at the bottom.
You’re on your own from here. Be careful not to break any wires when you pull it apart, and take pictures along the way so you know how to put it back together.