My Truma heater in our Adria Matrix SL 2018 is only working to half capacity on electric. I have been told by the reputable Adria dealer who I bought the vehicle from that it is likely one of the elements has packed up. They no longer provide single elements and I will have to purchase a combined component at a cost of Approx £800 + labour charge. My question is has anyone had similar experience of this problem. If so how was it resolved. Does anyone have any recommendations who might be able to carry this out. I live in N Wales on the border to Chester . There is no way I could take on repair myself as it is well out of my skill set.