solderless connectors

[1960bugeye]

Is there a diagram or a listing of the uses for the solderless connectors on the PC board.

My engine has H850X-PBC01 and I would love to connect a sound decoder. It certainly looks like I should be able to use some of the solderless coneectors.

Are the ones marked 'R' and 'L' for the right and left pickup? What are the LED + and - ones for?

Thanks,

Bill Schickling