No obvious screws of bolts to remove?
It was pretty straight forward with my JD 4300, but I realize that isn't the 4115. Just be real careful with pressure applied to the plastic tabs. I had my dash replaced by the Deere dealer mechanics on warranty, and learned they apparently were a bit rough putting it back together. Had to epoxy/fiberglass some of the tabs back in place.
What can you tell us about what you do see that might lead to removal??