I had a 2660. I ended up letting my local Bota shop do the 50 hour service, mainly because the mechanic told me that Kubota uses some type of break in goop in the oil when they initially assemble them. What it is, I don't know. But he was clear that you want to get that junk out of there. The 50 hour service was $256.00, and that included everything (they picked it up, and brought it back 3 days later). All hydro fluid changed, everything greased, everything tightened back up (i guess this was a big deal), and they replaced a front tie rod boot that had torn in the front. I figured the parts alone was going to be about $130.00 with filters and all. So, seemed like a good deal.
One other thing. I loved that 2660. What a machine. I miss it a little (small tear).