Yes that is correct. You should do a complete rebuild to include the sleeves. They get sloppy which causes seal damage over time. Then the leaks start. Sometimes you can get a nick in the fork tube that damages the seal (rare). Had this happen once. I've done forks on both bikes probably three times now. If you run off road in the rocks, it's hard on the front forks. There is a dust seal and an oil seal in there. A 2003 front fork diagram is HERE
The manual calls for a few special tools but the job can be done without them using a bit of innovation. Good luck.