I have a 08 Kawasaki 15f, first I am hoping to save some money and do the 25hr service myself, the shop here in Conroe is 270$, i know i need to change the oil/plugs etc... but im new to this so I don't want to mess up my ski! Can anyone give me a comprehensive list of the services the shop would perform? Is the 25hr just a basic maintenance service?

Also, i have gone past the 25hr to about 29, i was told that this is probably ok to do since 25hr is a basic maintenance, is this true? Since I went over, is there something I need to do extra?

History:
Ski runs perfect, never had any problems, light white smoke last season after pulling kids around on a tube for a while, had 10hr maintenance done at dealer, winterize and store in garage every year, couldn't ask for a better ride, hit 68 on the speedo, never tracked it with a GPS but its fast...