according to ADS, my unit was the first one with ultrasonic transducer failure. I do find that hard to believe now. If your utrasonics are dead, it has to go back to Germany. Ultra Systems is not equipped to make that sort of repair. It's a two month process to get it back. Ultra Systems did offer me a loaner unit, which is a nice service. I declined it as I wouldn't use it any way when I have the KL hanging around. I plan to sell my ADS once it is back. The warranty will expire this coming August.