A little over a year ago I bought a 65 reissue deluxe reverb used. The previous owner had put a frommel mod kit into it. When I got it home I noticed a buzz or rattle coming from inside the cabinet. It is especially noticeable at lower frequencies like an open 6th string. I have tried everything I can think of. I eplaced the speaker and the tubes. I took it to a local tech. He gave it back to me and said it was the only time he hadn't been able to fix a fender amp. So I sent it to Seattle to the frommel guys, thinking that since it had their mod in it they might know the issue. I just got it back today with the same buzzing. I really love the sound it gets minus the buzzing. But at this point I kind of feel like just selling it and going a different direction. But before I do that I wondered if there was anything else I could try to figure out the issue? I read somewhere that it might be the cab, is there any way to test that without having to buy a new cab? I really don't want to put any more money into this thing unless it will actually help it. Any ideas?