Hatching guinea keets

[hhk]

I have guinea eggs in an incubator (took turner out yesterday) that are due to hatch today but nothing so far. Today is day 28. I received them in the mail. Here is my problem. In preparing the brooder for hatch day, I discovered the thermometer is a DUD!!! it goes up as the temp rises but will not go back down as it cools. I am afraid they may have gotten too cool. is there any chance at all of any hatching if they were down to 94 degrees or is it just a lost cause at this point? I am sooo disappointed!