The first tree is in the ground, and possible has been run over by my dog. The second is on a shelf and hasn't been moved (except to turn it) for almost a year. good idea about ag extension. I think I'll take it to the bonsai nursery where I purchased it last June and see what they say.
I'd be more apt to go third party to identify an infected tree. Let the pro's who know take a look, that's why our taxes pay for their services. Has worked for me in the past. My issues were unrelated to bonsai but were thoroughly answered by helpful people.
I would also take back to where it was purchased. I would have a huge issue if a nursery professional sold me an infected plant. There's a certain amount of expectations we should all have about getting healthy, disease free material.
Side story - one of my fellow club members bought a cascade elm from an "unnamed here" bonsai seller. When he received it there was an issue with the health. He contacted customer service and was told "you sound smart enough to fix it". Not a cheap tree and he was afraid the sickness would spread to his other elms. He tried the seller one more time with no good result so he contacted the ag agent in the area and things escalated from there. The "unnamed seller" received a visit from some local and federal ag inspectors about his procedures etc. Long story short the tree's purchase price was refunded to the member and he kept the tree nursing it back to health.