There is no vacuum at the transducer so I know it's not the problem. The car runs fine if the wastegate transducer has vacuum from the other side of car. I could almost leave it hooked up like this but I don't like having the car not be correct. I just need to find out where the vacuum is supposed to come from. The hose disappears into the firewall and I can't tell where it goes from there.

The Mercedes dealer was no help at all. I think they are told to not help in order to increase work in the shop there.