Update on my leather seat problem: I spoke with the service manager at my dealership this morning and he did not hesitate to arrange to have the worn seat replaced. I was expecting a little resistance, but happily didn't get any.
OTOH, since I bought my car it has been plagued by a number of small, irritating problems (knobs, switches, etc going out), and I've often thought of trading the car in on something else. Mechanically, it works fine, but all these little things add up and since most of them are intermittent, very few of them have been fixed.
I discussed these issues with the SM today as well, and he assured me that he would look into all the problems I've been having, then take the car for a few days and see if they could get them all worked out.
Susan