Years ago I sold some baby sulcata tortoises to a guy in FL. He didn't want to go to his local hub for pick and insisted that it would be fine having them shipped directly to his house. He was an experienced reptile guy and told me he had animals shipped to his house all the time, so I let him talk me into it. The box sat on his front porch in full sun for 3 hours the next day. I guess it was not his usual guy and the replacement guy didn't know to ring the door bell. I ship with little thermometers that record the highs and lows. It was 121 degrees in that box, and all the hatchlings were perfectly fine. On one hand, I'm sad that those babies went through that, but on the other hand, they were all fine, and now we all know that sulcata babies can handle 121F for three hours with no ill effect. That is not an experiment that I would ever intentionally carry out, and I would never have guessed they could tolerate temps that high for that long in a closed box.The temp might have been a bit higher, and it might have been for longer. Hard to recall exactly as I was pretty frantic.
My point is this: Unless your incubator got really really hot, I don't think that the high temperature was the COD. I want to bring this up, so that you keep looking to see what the actual COD was, if that is even possible.