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Another sidebar/general comment. Are you keeping records of what you replaced and the outcome related to each one? It's getting tough to keep up with all the components you've replaced, and I want to make sure you're methodically tracking the cause-and-effect with each replacement/substitution so that you're not metaphorically chasing your tail in all this. Also, I'm pretty sure you are already doing this, but if not, be sure you're replacing one thing at a time (unless something is very, very obvious like a cascading fault that unequivocally fried multiple components).
Lastly, you may want to consider getting one of the relatively-affordable ESR capacitor testers. You can test caps in-circuit, and it could save you the hassle of shotgunning a lot of them (at least for the sake of diagnostics -- it's good practice to replace the electrolytics at this age).
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