I have been spending the last few months researching all this stuff. I don't recall seeing anything where people had VGT issues only after the truck gets warmned up. Due to people having issues with it sticking and going with a rebuilt/ new or aftermarket upgrade turbo I made the decistion to have mine rebuilt locally. Like I say the actuator tested fine on the bench but is only acting up while warm. I will be looking into AlpaOBD I seem to recall that one can calibrate the actuator with that. I'm just quickly running out of funds to throw at this truck.