I am buying a Trophy boat froma dealer with a mercury 15 hp 2 storke dated 2000. They have agreed to go over the motor for me before purchase and fix or replace anything that needs it. The boat is a year 2000 and they are claiming under 5o hours total use. Is there specific things I should have them replace like water pump, spark plugs, lower end unit oil etc that are out of date even though it has low hours. What should I be having them specificaly due. I am treating it like a wish list. Any thought would help, thanks Rand