I have no specific info on this vehicle, but looking at the NADA guides, asking $3k is a bit low for that year & mileage; they may just need money. Service records should be available as most Lexus owners are more meticulous about upkeep. You can also check it over or pay to have it inspected to see if there are any hidden issues. But honestly, I don't think there will be anything seriously wrong unless it has been in a significant accident. Run a VIN check and inspect it thoroughly...due diligence pays off, even if it is only for peace of mind. Hope this helps!