Squeal/squeak at high RPM in neutral

[eightfour7two]

Hey all!So just a few weeks after I got my PAS pump and turbo gaskets replaced, I'm faced with another problem!

This video shows it all really. Sometimes, but not every time, there's a horrendous squeal when you rev the engine in neutral.
I did some 30-70 runs in 3rd to see if I could reproduce the noise in-gear with no luck so far (Figured it'd go through max boost that way).

Anyone have any ideas? The current forum maintenance means I can't search too effectively

 

[eightfour7two]

Bump?

It sometimes happens in-gear now when I put my foot down. Can't figure out how to reproduce it systematically. Since it doesn't build with revs, I'm assuming it isn't one of the aux belt accessories :/