You may want to read up on Capillary Worms. There's several "species" and this dictates where they "live" in the body. Here's one link to get you started. (Note, I'm having issues with this editor and I can't get it off bold :hmm I'm not yelling at you, I promise:))...
I'm sorry for your loss.
Thank you for posting the report.
I agree you may have to manage disease like Marek's and LL. There's many folks that can help with that, Carol I'm sure will give you some tips.
One thing I notice on the necropsy report is Capillary Worms. Early on in your thread...