It continues...
Got the call this afternoon that my "beautiful E-Class is done". So I cruise over in the '06 Taurus they loaned me to pick it up. For some reason, the paperwork wasn't ready yet, so I waited around a bit. One of the service managers called me into his office and said there was another problem when they were getting my car ready for me. Apparently, they washed and vacuumed it and it wouldn't start again.
They said they'd call me when it's fixed again and sent me out in an '06 or '07 C230 sport