I am new to this forum so pardon my ignorance……..I have a 2006 6.0L with a new turbo installed recently and now the VGT Control Valve is making a really loud buzzing noise when the key is on and engine is off. I tried replacing the control valve and it still makes the noise, I also tried cleaning the EGR valve. A little background on this, it is an International chassis with a Gulf Stream motorhome it has less then 15k miles and yes the Turbo took a dump and was replaced with a re built one in December. It seemed to run fine for about 800 miles and recently started to make this annoying noise. The engine seems like it has all the power and does not have any other boost issues. I don't know how to read any codes or have any scan tools and there is no dash lights coming on. Anyone have any ideas?