In other words, slow it down to a speed that you *can* play it correctly (and I mean perfectly). make a note of the bpm, or the speed, at which you can play it. The next day, do your warm up exercises, and get it 2 bpm faster. Spend about 10 min at a time doing it. Each day try to work it up 2 or more bpm, but only go as fast as your fingers will let you. once a week take a day off from the solo. This method will get you up to speed pretty darned fast, and you'll be able to play that solo like nobody's business. But you have to be consistent in practice, or you won't get very far.
Hope that helps. :)