If you just want to service them, then you can change the fluid. Drain it out completely, then pour in 9.2 oz of type E fork oil.
No need to replace the seals and bushings unless they are leaking. Just change the oil right on the scooter.
That fork is basically just a damper rod POS. And would benefit from having emulators or cartridges installed. But short of that, you can help them a little, without spending a lot of money. Replace the E fluid with some 15 weight and add a 1 inch spacer to the top of the spring when you put the cap back on. It will firm and stiffen them a little.
You may know this, or perhaps not. But when you take that cap off the top of the fork, the spring is going to try and launch it out of your hand. And you'll have to force it back into place on the way back together. Don't have your face in the way, and do protect the shinny parts of the scooter. It can be done with a regular socket that fits the cap. A fork cap socket makes it a little easier. And a compression tool makes it an easy job. And if you are thinking that you'll change the fork oil every 10K miles as the manual suggests, you can get caps that have fill holes in them, making it unnecessary to release the springs next time you change the oil.