I owned one for several years.
Take the headstock top cover off and check the condition of the changer forks, plus the fiber gear. Also, the bed is not hardened so check wear on the bed. They are slender machines but very high quality. They don't like rough treatment.
Check the cassette deck styled electrical buttons to ensure they function without binding. Go through the forward, stop, reverse, speed 1, speed 2 cycle repeatedly until you are sure the operation is smooth. Also, go through all speed ranges with the paddle levers. The paddle levers can be problematic and can also jump out of their indexing marks / holes. Check all feeds on the threading gearbox. The hand lever should index smoothly.
If the lathe has been crashed, there will likely be evidence of damage on the gears. Check these closely and bring a torch. Also, there is a nylon gear that gets cracked on the banjo gear arrangement. Check this closely. You can always use a steel gear but this is to act as a weak link in the drive train of the lathe and is intentionally weaker.
Check to see if there are spare change gears as these will allow you to cut the various threads you will encounter later. Check the tool post collar for cracks. It is cast iron and a weak point on the V10(p).
I hope this helps.
Paul.