SRCM - I studied up on "Impressive Syndrom" as I had always known it when I decided to breed Beauty who is an Impressive Granddaughter. I didn't understand how the disease was passed down or really any of it. That's the only reason I knew about the labs.
As for Impressive being in your horses bloodlines, I think the previous owner is mistaken, but what you do have is Sonny Dee Bar who was owned by Dean Landers (One of the people that used to own Impressive).
"Be a best friend, tell the truth, and overuse I love you
Go to work, do your best, don't outsmart your common sense
Never let your prayin knees get lazy
And love like crazy"