Annoyed that nothing described on the forums was working on my 2011 D40 STX 550 (it has the nav screen option) I tried several combinations until I tried holding in both dash buttons then turning the key on. This reset the service reminder to 10000 but I had no way of adjusting the interval. I barely had the reach on one hand to hold the buttons in while I turned the key. Normally the left one swaps the outside temp between C and F and the right one just does the trip meters, while rotating the right button changes the dash LED brightness (and possibly dash lights as well). I also discovered holding the temp (left) button in while keying the ignition runs a dash diagnostic program.