Ok, I did it. I opened my incubator and took one of the dry hatched chicks out while one was zipping. This is what happpened, not sure if it was coincidence or not. I was fast, so there was no porlonged time it was open. But after I took it out the incubator took about 30 minutes to get back to optimum humidity and temp. It actually never got back up to optimum humidity so I had to add fresh water to do this. So it needed opened a second time. In doing this the zipped chick moved less and less, 4 hrs. later still no zipping progress. So I broke one of my rules and helped the little guy out of his shell, because I wanted to see what happened, if he got "shrink-wrapped" from me opening the bator. He sure was, he was stuck and too tired too finish the job, he chirped strongly for about two hours as he moved in the shell and tried to work his way out, but as time went on hisd chirp grew weaker, I really feel he would have been dead if I hadn't intervened and helped him out of his shell. I don't believe he was weak, I think me opening the bator when he was already mostly zipped caused him to get shrink wrapped in the shell and he got weaker from having to work so hard and long. I would have let nature takes its course and not helped him hatch, but I wanted to see if it was natural causes or did my opening the bator cause him his issues. He was fine until I opened the bator. He is alive and chirping and eating in the brooder now. Just thought I'd share my experience with this. I know nothing is 100% but I feel opening the bator did this as he was doing well until I did this.
Carolyn