I hope you are right desert....:)
Good news is that I now have two vets to choose from that can do the biopsy, if needed. One is the first one that Dr. Valberg gave me the name of. The other is the major equine vet in the area (the one you take your horse to for surgery) that does the testing. I spoke to one of the vets there on the phone and she sounded like she knew exactly what to do and even asked me which vet out of MSU I've been working with, after naming them for herself. Yay!