Believe it or not, I still haven't gotten my car back. They ordered a rebuilt valve body from their supplier, but there's apparently two different versions, and they got the wrong one. So, as of yesterday, they were installing the correct one, and were going to thoroughly test it to make sure it was working correctly.

In retrospect, I wish I had gone with the used one, as this is exactly the can of worms I didn't want to open up.

Thanks for the continued concern.