I know nothing about this except I saw the entry and wanted to pass it on. I bought a slightly used MK2S in January and have 1,700 hours on it with no problems.
Give us an update if you check on it or purchase it. Good luck!
https://dallas.craigslist.org/ndf/ele/d/denton-prusa-i3-mk2-with-spare-parts/7234963741.html