For all of you with more experience than me, is this common practice? I bought a new GK 400rbiv (which I LOVE) and after my initial purchase in September ('04) my gigs finally slowed down enough for me to take the head in to be checked for a few "questions" I had, which were 1) I couldn't get the input clip light to work; 2) I had never seen or heard the cooling fan to come on at any of my gigs, some of which were 3hrs long ( though admittedly I do not push the amp at all). After contacting a few people at GK and even hearing from TB's own Dan Elliot (thanks again Dan!) they all suggested when I could to take it to a warranty center to be checked out, which I have just done. Upon dropping it off I was informed that I would be responsible for a $60.00 charge if they couldn't find anything wrong with it. Is this normal? It seemed odd to me.