Compare what a new one just like it would cost to what it will cost to repair and then take into condsideration that you would have a warranty on the new one if something happen. If you cannot afford a new one right now then I would get it fixed and hope nothing else goes wrong on it.
It's a hard decision but we all have a lot of money invested in our machines and we also spend lots of time with them so of course we get attached to them. Think seriously about it and get back on your way to quilting