Don't mind if I jump in on this issue.
I am perfectly happy with my 1993 AVA Super Pas 4i preamp, even though I spent a great deal of time replacing bad jacks initially, but I didn't mind, I am good at this kind of work.
This gentleman discovered the headphone circuit board issue 13 years later, and AVA reassured him that it had no effect sonically, I think he should be happy just to get a response. How often do you use headphone anyway? I don't use mine at all.
AVA's willing to supply the better rocker switch for free, I think it's very good customer service (he would have to put them in himself).
Now why would he ask for a new volume switch? Can AVA just tell him where to buy one? (I want to know that myself, and the selector switch too, where can we buy them, Frank?).
AVA charge $9.00 for shipping small parts, I think it's kind of steep, priority mail would only cost around $4.00, first class would be even cheaper.
I think it's a non issue for both parties, just listen to the preamp and enjoy it.