Here’s the story. I have had the car about a week before I realized that none of the rear speakers were working. I tried the fade and balance controls, and no sound came out when turning it all the way to the rear speakers. I took it into my local dealer, not where I bought the car. The tech couldn’t figure it out. He put in a request to Toyota, and they responded to pull the amp from another car to see if that’s the problem. My concern is: what if he pulls an amp from a regular system? Will it work? I’m just a little afraid that they may try a it.