Mud, daubers...been there and done that. Those few hours on that old of motor should raise a red flag. Probably several rubbery things like impellers are in need of a good look. Definitely time to have a Suzy mechanic take do a good look around, read codes etc. I'd guess that engine oil, lower unit oil and impeller are definitely due for replacement. None of those are bad jobs to do yourself. Make sure you have an owners manual. I also always buy shop manuals. Although I do my own boat and engine work, (mostly), keeping a shop manual with the boat allows a "good" engine guy to work safely on the Suzy even if a different brand is his major area of expertise. I love the Suzuki's. You will too.