Hello, I have the amp listed above and it is having an issue. A few months back it would have issues where the sound would cut out after moving. Usually I was able to get the sound back up but after a couple of weeks of this it stopped entirely. The amp would power on, the tubes would get warm, but no sound would come out. Does this sound like a wiring problem? Is there another likely cause? Approximately how much should I expect to get it fixed if it is simply wiring? Thanks for all the help.