Could be a very many things.
I would start by checking all your intake/discharge and vacuum hoses for leaks/loose clamps.
Then check your exhaust gaskets near the turbo for evidence of leaks, ie. soot around the flanges.
Put a spanner on your intake manifold bolts just in case.
It is more likely to be something along those lines than the turbo itself, but it would pay to check it when you have the intake hose off.
Check for excessive oil in the intake (very small amounts are normal for that sort of kms) excessive shaft play (if you know what you are doing) any damage to the fins or evidence the compressor wheel has been contacting the housing.
These are good places to start.
Shane
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