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You might also call Coda. These people came from Threshold and might be able to help.
please also call Threshold Audio.
Also please contact this company:
Vintage Amp Repair. Vintage Amp Repair performs maintenance, restoration, and custom modifications on all makes and models of audio tube amplifiers.
Another option is True Sound in the SF Bay Area. A phone call is suggested to find out if he can repair your Threshold preamp.
“Not only do we bring the dead back to life, we specialize in refining the musicality of your equipment by selectively modifying individual elements. We also provide meticulous restorations of vintage equipment, especially valve (vacuum tube) components”.
Lots of good references here. Choose carefully, things like this can effect resale value. Threshold, is new Threshold, but still Threshold. Pass Labs has obvious lineage. Coda are ex-Threshold engineers. Jan Soderberg of Vintage Amp Repair in California is ex-Threshold as well, and well regarded as a Threshold specialist with Nelson Pass's blessing for such things.