Hi Manoj, the first question I would ask is, are you having problems at the moment? If the answer is no, which I suspect as you say the car drives superbly, relax and enjoy. You could have many more miles to go. I had one unit fail which I now suspect was a Lexus dealer on a “health check “ giving false diagnosis (not saying where). I used Paul Frost and got a replacement unit that had done 40k, he told me the car it came from originally was owned by Mick Hucknall. The cost as I recall was £170ish. His no is 07590 072646. He will also tell you what the likelihood of failure is. He had an LS 430 in daily use with over 325,000 miles on the clock, but he does send many of his parts to USA. Good luck with whatever you do , Cheers, Roger