The rubber elbow at the EGR sensor is just about gone. Obviously this is an issue, it needs to be replaced, and it's on today's to-do list. Oddly though, I haven't seen the check engine light come on at all. I know the light is working, as it illuminates when starting the car or the few times it has stalled, but it's always off when driving. That said, I haven't driven the car more than a mile or two at a time so far, so it just a case of the car likely not coming up to full operating temp yet, thus EGR not being involved?

Correct.

That line comes into play at about 70mph after about 10 minutes.

I drove mine for a few weeks and never saw my code 32 until I took it for a run on the highway.