Welcome Tom.
I agree with the first line of James` response to you.
If you did buy from a Dealer , Do not however, follow his advice in his next paragraph,,,,,,, lest the Dealer disowns the car claiming that you have done something that has caused your niggle(s).
If you bought the car privately, then take it to your Lexus Dealer and obtain a quotation for remedying such problems as they find. Then report back to the Forum with the findings so that we can advise you further.
Good luck.