Arneson is owned by Twin Disc and is usually pretty straight forward to service. So every place there is a twin disc centre they can repair Arnesons. There is usually the belows (expensive) about 2000 US$ for ASD11 or 12 for above 800hp up to 1400hp. I think you need to change these every 2 seasons. In Italy where surface drive are very popular I think to remember they change these with stainless belows which dont need changing, but just a clean up.