open rear lid. remove plastic deck by unscrewing all screws. The four bolts are right there, two on the left and two on the right.
Iz zimple... You will then have to fiddle both top and bottom sections out. There are metal tabs attached to the bottom section which slide under the top section. Top out first.
You will then see all. You will be aghast. Clean everything before doing anything else. The road dust will be light colored. If there is black dust that will be the aluminum from the sprocket which will also tell you that the belt likes to eat aluminum sprockets! Talk to it sternly. It won't help a bit but you might feel better.
use reverse order to replace.
