I have a 2005 SC430 and I am having problems with the Radio. Sometimes it works when I turn on the engine, after a few minutes, no sound will come from the speakers. In an effort to determine where the problem is occuring, I used the navigation system, and found that the sound worked. So the problem must be the radio. I took the car into Lexus, and they said it would cost $1100 to replace the amp. Really? Does anyone know where I can get the radio repaired. I don't want to spend $1100 on an amp. My 2004 SUV RX330 doesn't have any problems with the radio, and that car has over 100,000 miles. This car only has 62,000.