So after battling my limp mode issue til I could take it no more I took the car to a local mechanic who is very knowledgeable with TDI's. The result was that he believes I have an internal issue with my 10k mile old turbo. I can get full boost at full throttle, but at part throttle he cannot adjust the new actuator to get the boost value requested. He believes that there is a problem internally either with the vanes (missing one?), or the vane actuation mechanism in the turbo is bent/ damaged. I would have him pull the turbo and examine it for issues, but I just bought the car and have already had to get the transmission rebuilt. Removing the turbo looks fairly straightforward. I am just looking to identify any tricks that I should know about and I am also wondering what parts I should replace while I have it off (gaskets, etc). Any help is appreciated, here's a pic for your time