I've re-capped a number of DSP5500's and DSP6000's with excellent results.

The process is very similar to that of the DSP5000's...
All the capacitors need to be changed (some 38 capacitors!), check the resistors (but they're normally OK)
There are two separate amplifier boards, four large power smoothing capacitors, and a smaller power supply board.

Drop me a PM and I'll send through a list of components. It's not cheap, especially if you replace the four large smoothing capacitors but there is certainly a noticeable improvement in sound.

Cheers,
Steve