Does anyone have a manual for a Cannon Mag 10 electric downrigger?

I bought 2 used Mag 10's and have no manual. Each DR has two switches on it. One is your basic up/down switch and the other is unlabled. It's a simple push button and I suspect it's used for setting the up stop or something similar. They also have "positive ion control" but I don't think it's adjustable, unless the unknown button is related.

Can anyone enlighten me or possibly photocopy and mail me the manual. I'd be happy to pay for the cost.

Thanks!

Braz