Oh and i meant to add that yes, if your bator has been running a bit warm you could have an early hatch; I had a set of duck eggs that hatched 3 days early because of that.
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It looks like there is a plate there on the center front above the window, is there one there or is that just a mark where one was? If it's there, what does it say? that might give a clue/ Also there is a thread here about redwood incubators, you might show it there, someone might have an idea