Odds are your action is fine. The oxidation color changes aren't necessarily the best indicator of whether the temper was affected, but it at least gives you peace of mind that you didn't reach oxidation temperature.
What kills an action temper is heat and time, so low heat for a long time can do as much damage as much higher heat for a much lower time period. But from what you describe I wouldn't be too concerned, as you had minimal heat for minimal time with no oxidation.
Sorry I've been out of the loop, Uncle Sam has me in the middle of the desert, and internet access is "spotty".
Jimro
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Machine guns are awesome until you have to carry one.
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