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

Main: 861v6 (LPS), 808v6, UHD722, DSP8000SE Anniversaries, DSP5200.2HC, DSP7200.2, SW1600, Sky Q, Cambridge Audio BD, Roon, M80
Office: 861v4 (LPS), 818v3, 800v4, HD621, M&K S150P, DSP5500HC, M&K MPS2810 sub x2
Son's system: 861v4, HD621, DSP6000.2, DSP5200HC, DSP33
Spare: MCD, 100 Series, 200 Series, 500 Series, F80s, C15s.