It could be any number of very minor or not so minor things. I really hate to even speculate. The fact that it goes away after warm-up is disconcerting though since it means something is not operating to spec until it's warmed up sufficiently. It's probably gunna end up something irritating like a sticky lash adjuster or something of that nature.
Have you noticed any oil consumption to speak of or puffs of bluish gray smoke on cold startup?
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