Hello everybody I bought used bass amp GK 700RB for really good price (250), but when i realized that there must be fan in the amp. I open the amp and the fan is in it, but it just isn't working, although the fan is connected to the two pins where should be. It seems like the fan is broken, what do you think? it has two pins, something like this: http://t0.gstatic.com/images?q=tbn:ANd9GcSOYlJDBVzCK6aYnYF5Ptt-oYBuJBf30eFsWoQszgs3Tr5-nOoQOG8XUXmr And which fan i should buy to replace it? thanks!