Well, I just spent and hour trying to isolate the rattle in my rack and it is coming from my PLX2402. It really takes of when I hit a C and appears to be getting worse. I am willing to send my in but how long will I be without it? Anyone have any experience with QSC on repairs? It happens every time I use it, appears to be getting worse and it is loud enough to be a distraction at practice. Bob Lee, any updates on this issue?