Hi Paul,
Looking back on at the threads on the subject that I know of it does not not appear so. I think it seems to be just how well the dealer makes you're case, low mileage, full Lexus service history even how many Lexus vehicles you have had before were all mentioned when I was at the dealership. I would say if you are having the same problems with a 21 reg vehicle then I would have hoped should be no problem IMHO.
Bri