A very recent fault this one on here and we seem to have narrowed it down to the Turbo Actuator. What's happening is the actuator operates the waste gate on the turbo and whether the actuator diaphragm is goosed or the hose to it from boost side of turbo is blocked with carbon, the Waste Gate is not operating. So hence we have over boost on booting it, ECU operates the management light, power is reduced and code P0235/7 is recorded. P0069 is probably over boost pressure. Sounds too good to be true but hope it works for you. If not record your answer on here. I have same problem at moment but working on it is a problem. Mine started shutting down quite recently but a new boost/temp sensor sorted that out. The problem is getting an Actuator as their normally sold with a turbo.