buying a beat up 2012 outlander XMR 800

I’m going to look at a cheaply priced XMR this weekend I need to know what to look out for as far as issues with these bikes. The quad appears to be fairly heavily mudded. It has around 350 hours on it, aftermarket exhaust and turner axles all around. Ive heard quite a few problems with XMR quads in these forums and I’m just hoping to get some sort of checklist for commonly broken parts and what I need to really look at.