It's only complicating when they start to die, and we can't figure out why.
The name of the place is the Georgia Poultry Lab. Go to their website
HERE and find the location closest to you. Then you can email the veterinarian in charge of that location and ask them how you would go about submitting a bird for necropsy. Diagnostic necropsies are no charge. It will only cost you the postage to send it in. If you live close enough to any location though, they may let you just bring it by.
But I am STILL waiting on results from mine, and I sent five dead chicks in on May 22nd. I emailed him today to ask for an update, but haven't received a response yet.