Hello, welcome to JustAnswer. because of the range of possible issues, this may take more than one post. Please, don't hesitate to reply.
The pump servicing is the same as the two stroke. And not something you want to skip.
The motor is not the same. You do have oil to be changed, oil filter, fuel filter.
The oil and filter needs doing every year, the fuel filter should be checked then too. So there is a little bit more to do, and more often. (every year vs every other)
Your owners manual has the exact maintenance shedule listed right in side it
I will look for the owners manual, I am pretty sure that will be possible.
NOTHING holds up to salt. It is the most evil thing you can do to your watercraft.
Salt halves everything when it comes to maintenance. So you do everything twice as often. It does have a service light, and the oil I believe is once every year or 100 hours of use.
But let me check on that manual. . are we picking random or do you have a specific model in mind?
The link below will take you to seadoo's owners manual page were you can down load or just view any one you want, but only up to the year 2009. They haven't published the later ones to the site yet.