Factory Nav

[Screeper]

Ok so the factory navigation in my 2004 H2 has been working like crap and the dealer said bring it in. They told me they were going to replace the nav and the antenna. I picked up the truck and noticed that all my radio stations were still set and all my way points were still in the memory. The nav still worked like garbage. I called the service tech and he said that they replaced the brain of the nav but not the head unit. I think I have to call Bull**** but dont want to say anything until I know for sure. Does anyone think they can just replace a "brain", and if so can all the memory remain untouched. Thanks for the info if you know.

Al