After years of faultless service our Bosch Classixx 1200s express developed a fault, the machine didn’t complete its cycle and all the spin speed lights were lit, but the main start button was unlit. I managed to reset it by turning the knob to 6 holding the button in etc and it reset. The machine was then run empty but developed the same fault. I reasonably competent at hauling stuff to bits and any advice will be appreciated