I think it's actually option three: 10L. I somehow missed this when fixing some other issues in that manual, but I just checked, and Shawn had made a note about this issue. I believe the reason was that 8L was getting pretty crowded; both 8L and 10L are on the ground buss, so either should work. The pics on 60 and 61 are at a bit of an odd angle, which makes it look like the wire goes to 9L. If you look at 62 you can see more clearly where it is going on.
You may want to wait for a smart person to confirm this.