I am trying to save some $$$$$ and get to know my ski so I want to change the oil myself...and I have a friend who will be helping me do that

My question...what other services does the dealer perform at the end of the season to get ready for the next?

I know it is actually the beginnning of the season right now for most of us, and here in So. Cal the weather is warming up and I am hoping to get out on the water in April...I just want to make sure I am checking all the things the dealer would and making any adjustments or cleanings that need to be done...

From what I heard change the oil and fill up the gas and I will be good, that is why I went with Yamaha!