Got everything apart today. I consider myself a reasonable geek/techie, but was moderately surprised at what I found. HDMI to/from the DVD player (which is the foundation for the surround sound system). Optical audio from the TV to the DVD player. Composite audio and video (video is the "yellow" cable) between the TV and the "connection station" in the right front glass cabinet.
I will make some changes tomorrow and post the results (e.g., replace all composite with component and/or HDMI). Note that in order to get anything to play through the surround sound setup, it needs to connect through the DVD player (that's what the six surround sound speakers connect to).
I wish I had read more closely about short cable connections to the TV. The HDMI cable connection into the TV bent to the point of snapping as I removed the TV from the installation brackets. I might have to replace that (my own fault).
All in all, a nice job by PC. I might have done it a little differently, but the installation defaults are perferctly reasonable.
Thanks,
Steve