Accuphase e-204 [english]

Accuphase E-204

I believe the relay switch on my E-204 has died.

A while ago it stopped working for a week (no relay click as it powered on, assume it was the relay).
It worked again for a while again, but is back to not working (power up, red button lights up but no relay click, nothing does anything
Before the (probably) relay issue, I had crackle from the volume pot. (and one of the EQs), never got round to fixing it.
Sometimes the volume pot would result in lower volume from one channel than the other. Twisting it fast would fix it.
I have heard that no standard part is made that is compatible with the old relay switch and you have to modify things.

My questions:

A) How much might it be worth to some one interested in repairing it? (I live near Frankfurt am Main and am only interested in some one who can collect it)
B) How much might it cost (at least / certainly not more than) to have a shop repair it (assuming relay and volume pot replacement)

If A is low and B is high I will probably do some research and change the relay and clean the volume pot myself.

If anyone has info at hand about how to deal with the relay change then it would be welcome!

Note: I have never used it with a turntable in the 14-15 years I have owned it, so I don't know anything about the state of those inputs.