Whining noise CM2250

[SquareOne]

Is it intermittent? Does it occur only in the lower RPM ranges (then abruptly go away), or after a fuel filter replacement? Is it a whine or more of a harmonic hum?

If the above info sounds like your issue, I believe it has something to do with the fuel lines and banjo fittings (wear possibly, but can't remember for sure). There was an updated fuel line which needs to be installed with the newer revision of the high pressure fuel pump. Not sure if you completed that the last time the internals were replaced, but it may be a good idea to find out.