So... I finally got around to it! All I had to do was solder a small cap across the power terminals on the bottom of the power supply that feed the main board. So much quieter. One other thing, I removed the black paint off the screw that has an obvious ground terminal on it. Paint on the screw will prevent it from making a connection. It was a TDK multi layer ceramic cap at 1.5uF. Bought from Mouser for $1.69. Link is here. It worked for me but results may vary as it is a mod and it's the only one I have done.