Not a clue, but it might be a good idea to see what the prices for Turbocoupe and Merkur turbos are...if there is a problem internally. Now if you did get frustrated enough to remove the turbo, you'll find a common cracking around the smaller of the two holes on the exhuast side of the turbo. Not imporant.
Oh, did you do a compression test? Forgot if you did or not.
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