Whine linked to engine speed

Hi all,

I've got a 2010 FL2 with 71k on the clock. We had to get the turbo replaced just before Christmas, and all was good, however I've started to hear a low whine that matches engine speed. Any ideas what it could be? I mean, there's a chance it's normal and I'm being paranoid...

We've already had to have the haldex, rear diff and turbo sorted...now I'm starting to get nervous!

Thanks for any help!

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