I was able to get it to work with the following instructions:

20df07.S=20df03.S
20df07=20df03.LS

These codes represent the tuner button shifting control between suspend and play. I probably could have gotten the "power" button on the remote to do it, but it kept cycling through sources first. Since I only use the player, and have no need for the tuner function, this works just ducky.

Thanks everyone for your help!