While such a technique has worked for some kinds of equipment, that doesn't necessarily mean it's a good thing for your 4000. Temps hot enough to reflow solder will also potentially melt any of the plastics installed too. What trouble are you having and what steps have you taken so far to try and zero in on the problem?
A method I've used successfully to locate problems is to put light pressure on components or areas one at a time while either watching a good system bootup, or applying with the system running and watching for lockups.
Another is to use a heat gun very selectively.
Depending on the issue you're having, it could also be you have a chip somewhere that's overheating and failing intermittently, or a cracked chip socket.
Plaz
