I recently checked my impellers for wear and tear and wanted to show how it was done with pics as that always helps me. This was on an 07 X2.
First locate the rear ballast pumps in the rear cargo areas behind the back wall carpet. Three screws hold in the back wall panel.
Once the wall panel is removed you will have access to pumps.
Remove impeller and replace with a new yellow if needed. They only go on one way so no worries. One thing to note is make sure the paddlewheels angle in the same direction counterclockwise all the way around it as the impeller is intentionally bigger then the space you are putting it into.
Mine was ok but this is it installed.