Hi
Surely its not worth the hastle of fixing it - a new Varistream is not thousands of pounds. By the time you have messed going to Maplins and then trying to fix it, you could have earned the money to buy a new one.
What happens if the components you buy don't work? You will have to replace it anyway. My advise is to 'bit the bullet' and order a replacement now - don't forget a box of 10amp fuses as well.
Spruce