hmc, welcome.
After 18 months first give the boat a warm hug
The wiper arm if not rusted to the point of breaking can be removed sanded and repainted. I did this on my 97' 2400 SCR. You'll need a puller to get it off, i used a battery ternimal puller.
I would change the fluids as cheap insurance in case any water has accumlated from condensation over 18 months.
Good luck an let us know how the recommision goes.
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