Nothing stands out to me in the first horse pedigree. I did not go back any further then what toy gave a link to, although there are some names with Leo, bar, Hancock, and king, so further back the horse may have some good lines but after about the 4th generation no one really cares. Also if you have a copy of this horses original papers if there is anything they have or have not been tested for that AQHA believe that should be tested for or may have it will say it on the papers. Other then that I would say to call a good equine vet, does not have to be from your area, and ask them.
As for the second horse, he has some nice lines.
Doc bar, three bar, and Leo really stand out to me but I just glanced and did not go back any further. I would not worry about him, his lines are fine as far as I know.