Bernini Minimatic sewing machine to fix (Teddington TW11)

Small electric sewing machine in red plastic case, handle broken. The machine was all working well. I had bought reconditioned from a sewing shop. But in the heatwave I think it got too hot. I could hear a sound like arking inside and switched it off. There was no burning smell. It could just be a minor repair to someone who knows electrics, but I just bought another one. If anyone wants to have it to repair, they are welcome to it but I am not plugging it in again for a demo!