There's a notorious kind of noise with the TDIs- a metallicy, chirping/squealing belt noise that comes from the front passenger side of the engine bay. The noise goes away when the engine warms up.
There's a lot of discussion on it at tdiclub.com
Mine was a failing timing belt tensioner. Others have found it to be serpentine belt pulleys. Some have found it to be timing belt chafing. You have to localize it a little better.
Read up on it. Did the people who did your timing belt replace all rollers, waterpump and tensioner?
If you're confident TB job was done 100%, it's probably something more benign about the TB belt or it's something within the serpentine belt path most likely.
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