Conrad Johnson SC-1 Preamp sonographe Sell or fix?

My husband owns a Conrad Johnson Preamp since the 1990s. The selector switch has been fixed twice over the years. The last time, the selector switch stayed "scratchy." We haven't used it for 10 years due to this problem and it is hanging around my house as "decoration" as my husband can't seem to part with it.

Three questions:
Is there a resale market for this component considering it has this scratchy selector switch?
Or is there a reputable place to get it fixed (since hubby said we could use it if it is fixed)?
If we were to sell it, how much (with scratchy switch)?