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The problem is that the internal wastegate bushing and shaft wear at a fast rate. As they wear, the actuator adjustment quickly is taken out of spec by the "slop" the wear creates. Then while the actuators are out of adjustment spec, you get and even more aggressive wear rate on the internal wastegate components. This will take you to a point of the wastegates barely allowing movement- at which point the whole turbos need replaced. Glad you got them resolved, but you likely still have excessive wear in your internal wastegate components that will come and get you at a later date (but hopefully before 82k).
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