I seem to be hearing a loud quealing noise when I depress the clutch at over 5000rpm. It is only when the clutch pedal gets pressed and only seems to happen when the engine is colder.

Does anyone have any ideas what this could be?

The engine whines like the belts are worn when the engine is cold as well, by the time I get to the dealer the noise is gone and they can't re-create the problem.

I have 39k miles, and just had the timing belt tensioner replaced.

thanks in advance