Rich,
As to the Bose amp issues, Common problems are that the speakers either produce a popping sound that can vary in intensity or a hissing or high pitch buzz that also varies in intensity. These sounds may come and go from time to time so don't think it fixed itself like alot of people tell me. Electronics doesn't just fix itself. It gives you warnings sometimes that a complete failure may be soon. These noises are your warnings. This is generic information about the Bose systems no matter what car they are in such as Mercedes,Nissan,Honda,Cadillac,Etc...