Try removing the grips and spraying some oil inside. Then dry firing it a bunch of times. Maybe its dry. Might work itself out?

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I'm thinking it might be some small internal chip or burr from the machining process. I'd like to try flushing it out (and lubing at the same time). First I should probably try hitting it with compressed air. I hate to remove the side plate and have the mothership detect that and diss me for screwing with it. I could get it back from warranty repair with a bill.

I think a can of rem oil or clp would be just as good as compressed air. If you dont want to take the side plate off, just remove the grips and you can pour drops inside the frame where you could see the spring.
They wont deny you a warranty for removing the grips or the sideplate.
I sent in a 629 with a trigger job for warranty and although it was for a canted barrel, it got shot a whole bunch of times when they had it. They didnt bother cleaning it too and sent it back fixed.
You can put oil in it. It's your gun. Just dont put grease inside. It has to be very light oil.

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Understood on the very light oil. I know the potential for trouble quite well.

I've also decided that I'm going to shoot the gun before sending it back. No sense in not identifying all problems before it takes a trip back to the mothership. That forcing cone/cylinder gap looks extremely small and I could see it causing trouble as the gun heats up. I believe the best way to test for that is with live fire.

I'll also admit that I am curious if a little live fire will loosen-up whatever is binding or blocking the action internally.