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The PSU parts of the DSP8000 are purely transformers and don't degrade, so there isn't anything to do there...
I found that the amplifier boards in my DSP8K Anniversaries badly needed a re-cap - several had popped and others were leaking - Not a job for the faint-hearted!
If your mid-range drivers are the 8-bolt drivers (from the earlier 8Ks), then they are no longer available, the six-bolt drivers should still be available.
I've not changed the surrounds on any speakers, I can see that it could make a difference although there are ways of rejuvinating the existing surrounds.
Cheers,
Steve
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