What is done for the 20hr maintenance on the TRX400?

When I purchased my TRX400 about 2 weeks ago they told me that there was a 20hr maintenance that needed to be done. The Honda store that I bought it from seems to be very reputable so I am taking their word that this is something that "must" be done. They gave me a price of around $210 for this 20hr service which includes them picking up and dropping off my 4-wheeler back to my house. Do you guys recommend I have this done at the dealer? Is this something I can do myself? What does this 20hr maintenance consist of? I am ordering a shop manual is there any that you guys like or should I just get a Haynes manual? Any input would be much appreciated. Thanks in advance....