So my Gallien-Krueger 1000RB sounds amazing and puts out a ton of power, but it's got a problem: it goes into thermal shutdown. I knew that heat issues were legion with this model when I bought mine off eBay, but the seller swore that the mod he'd had done on it--rewiring the fan so it was always on--took care of the heat problem. For a month or so after I bought it, it was fine, although I wasn't practicing a whole lot in April because of schoolwork. Now that I've racked it and am using it an hour a day or more, the heat problem has become a serious annoyance. It shuts down after 30 minutes or less, and won't function again for at least another hour. I've thought about having a ventilation grille cut into the back or the top, since the only ventilation holes on it are on the faceplate, but this would destroy what little resale value it might have. I don't think a rack fan would help because the chassis isn't getting hot. Is there anything I can do to address this?