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2004 vision turbo drop out

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I have a 2004 mack vision with a 350 engine.  I sometimes get a 4-5 blink code and the turbo drops boost.  I thought it was the actuator pin so I removed it, cleaned it, and lubed it.  It seemed to be fixed but then it came back.  It seems to work better when it is fully heated up.  I checked the maintenance records and discovered that the turbo was replaced about 2011.  I also get a flutter in the control and I can see the actuator moving in and out as the control module applies pressure then vents it.  It almost seems like it is hunting for a position some times.  I put it on an independent air supply and the actuator goes from upper stop to lower stop with about 80 psi.  I was told that the actuator/sensor needs to be replaced, and I don’t mind doing that, but I am not sure how to determine if that is truely the root cause.  Can someone give me some advice here.

The turbo that is currently installed in the truck is 631gc5176DM12X

Edited by Bill Boyce76
Missing part number
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