Interested in what makes your new Kindle Fire HD 7-inch tick? The crew at iFixit certainly is. As is the repair shop's custom, it just tore down Amazon's new reader tablet to gauge its repairability as well as look for any surprises. In the case of the revamped Kindle Fire, the fixable design is the main surprise -- despite being skinnier than its ancestor, the tablet is easy to open and its components (usually) easy to replace. We're not as shocked by the choice of hardware makers, which inc