I did my 15K service at 25K + valves. I had some other nuisances taken care of too. I'd rather not say what I paid, but it was well north of $700 bucks. I had exhaust bolts tightened, warped calipers, air filter, spark plugs, and that stuff. I was afraid of the valves, I think that I will be learning in the future. I could have done the rest, but since it was apart....