I want to disable/deactivate the Pandora option as an input. I had it set up like this before, but my vehicle was in the shop with the battery disconnected, and now I can't figure out how I accomplished it.  Any advice?

Set pandora connection to "iPhone" even if you don't have an iphone.  That's what I do on my 4600 and Pandora no longer appears in the source list.

If you have an iPhone, I don't know what you'd do.