I had the same problem a few months back, i was told the same as you by the company that serviced my equipment at that time.
I rang Prochem direct and asked if this was the case and the response was that, they can get hold of the elements from America, unfortunately the cost of the parts and postage, then labour to get it fitted was more than the cost of a new unit. And they would only give a 3 month warranty on repairs, not the 12 months you get with a new unit

I bought a new unit from Olympic cleaning for £280.00
Mark