What state are you in? There are still good shops around the country doing repairs. I have searched out many of them as where I live in HI there are no shops left. If you look on AudioKarma.org a number are listed as supporting the site and you can easily research them.
One of the earlier posters noted this but its important to repeat. You may find that for a few hundred more you can buy a much newer, better preamp that is more modern and reliable. That is easier used than new but depending on what you want you should check out Emotiva, Schitt Audio for starters for direct to consumer new gear at decent prices.