I just looked up the "xclap heat gun fix". I seriously doubt that it would have any lasting effect. The idea is that it reflows the solders to solidify the connections but you'd need to know what you were doing to do this without risking killing at least some components, or at least bending their values somewhat. A bad idea in general unless you really know what you're doing.
In the cases where it appears to work, people seem to report that it often only works for a limited time, which makes me think that it's just the process of taking the box apart and putting it back together which jostles things around a bit so they work. It would probably be just as effective to just whack the box a couple of times.
Torben