Hi, I've got a Hartke 3500 bass amp and the fan's broken. I need it fixed by Tuesday but I haven't got any money and the gaurruntee's expired I'm thinking a fan shouldn't be too hard to fix myself. Is this incredibly ill-advised? I know virtually nothing about how to fix stuff but I'm assuming it will all become apparent when I crack it open. It was damaged in a fall so I thought maybe a wire's come loose or something, this being the case I think I could fix it but I don't want to make things worse. Any advice?