I pulled the covering off the tunnel and I can get into the top where the shifter goes. Shifter forks look fine, as does the spot on the shaft that it sits on. I pulled out a piece of something that looks like plastic, possibly 7x381 from the diagram. The diagram shows a couple of other parts that aren't numbered. I don't know what those are.
I assume that plastic piece is what holds it together. Anyone know where I should go from here?