Whoohoo!!! Bought two switches with keys. Turned out both keys were 5101's and worked fine without replacing the switches. So I was able to get in there and first turn the @$5$@@$!!! volume down. It was at max, and was driving me nuts

I was also able to raise the amount of $$ I could add to it (it was set to $40 max), and a few other settings.
I was disappointed that I couldn't change the payout percentage. One machine was 91%, and the other 87 (the lowest). I would like to get both to 96%, as my wife likes to win more.
Thanks to everyone for their help! I appreciate it!