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I'd still bet spark plug tube, O-rings. I did mine twice during the 10 years of ownership. First was preventative, doing O-rings and tubes during a spark plug change. Second time was due to a 'smell'. There was no visible leak but a bit of oil was weeping out and dripping on exhaust manifold. No smoke or anything. You might want to take another look and not dismiss just because it had been done at one time.
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