Mine had a similar noise. My noise sounded like a high pitched grinding that would go away when you pressed in on the clutch. Drove me nuts. It wasn't until the it broke down that I found the problem. The noise I was hearing was the clutch. The throw out bearing had been installed incorrectly by the PO. It ended up wearing against the diaphragm of the pressure plate until the pressure plate failed and the bearing went right thru it.
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