Ray, I'd suggest you have a Yamaha tech check out the motor fully, takes nothing to wreck a motor with a $7K or more repair bill, they don't put out a whimper either beforehand letting you know.
As far as filters go, particlualry the VST filter, if you can handle tools you can do it yourself. First time is learning, lots of parts to drop and tiem wasted. Google or Utube for the slide show step by step, or someone here might have it. There are two ways to do it, I do it when the boat is in the driveway as I leave the tank on the boat, removing the tank is the other way probably less parts to drop more suited to dockside service I'd say. Opinions vary.
I reuse the VST filter after cleaning it, and go 3 yrs on the tank O ring. Just be sure not to pinch the O ring when putting the tank back together. The in line filter in the metal can I do every 2nd season, pricey little filter! I don't bother with the LP filter, changed it once in 6 yrs, but I have the Racor 2 micron first in line in the boat do those every season. There are two small inline oil filters, one at the boat mounted oil tank and one on the motor near the VST I do also, infrequently.
I did the water control valve once, as well as T stats. The water pump is anotehr DIYer job, take your time first time, get the slide show, otherwise you will be stuck when the woodrift key refuses to come out!
I find the HPDI well desigend as everything is servicable and can reach all w/o special tools, even though very well stuffed under cowl.
Your O2 sensor and mounting body is another one to remove and clean.