HELP, Lost two birds in a month. We did sort of a necropsy, any ideas?

Hi guys,
Last month we found one of our hens dead now today we found another. DH and I opened her up hoping to see an obvious sign of what killed her but we didn't. Maybe if we had processed a chicken before we might of seen something amiss but this is the first one we opened up.

There wasn't a lot of food in the crop and it did have air in it. There was no egg stuck we did find two full yolks and one tiny yolk. There were no worms that we could see.

The only thing we seen that seemed off was the meat in the lower area of the bird was yellow. Is that normal? The breast color was pink.

They are eating Kent multi flock mixed with Purina Layena. They have grit and oyster shell in two little pails and get scratch in the am about a quart or two thrown around the run area. I do let them free range a bit but not lately so I doubt she could of eat a poisonous plant.

I am feeding the mix because the multi flock has a higher protein... could that be the problem? What are the odds of two birds dieing in a flock in a months time and there not be a problem?

I told DH if we lose another one we'll have to go to the state vet and have them do a necropsy so we know what is up. I couldn't bare to lose the whole flock.
Thanks
Rhonda

1) What type of bird , age and weight. Easter Egger 10 moths 2 weeks old weight unknown maybe 5lb
2) What is the behavior, exactly. Was acting fine till found dead this am. She was in corner head to the wall
3) How long has the bird been exhibiting symptoms?all seemed ok
4) Is there any bleeding, injury, broken bones or other sign of trauma.No
5) What happened, if anything that you know of, that may have caused the situation.no idea
6) What has the bird been eating and drinking, if at all.Her crop was not full at the time of death. It was airy when we cut her open
7) How does the poop look? Normal? Bloody? Runny? etc.she was in with about 30 birds no odd poops noted
8) What has been the treatment you have administered so far?necropsy
9 ) What is your intent as far as treatment? For example, do you want to treat completely yourself, or do you need help in stabilizing the bird til you can get to a vet?Hoping to prevent it from happening to others in flock
10) If you have a picture of the wound or condition, please post it. It may help.nope
11) Describe the housing/bedding in useWood chips DE Lime and sweet PDZ use under the bedding