Repair for Tandberg Troll?

I have a Tandberg Troll integrated amp whose input selector and volume attenuator both need repair. Electronically, it is fine. As Tandberg is long gone, I cannot find a facility. Someone recommended an outfit called Sounddesign, which did Tandberg warranty service for many years, but owner refused to take my Troll.

Office system -- Troll, KLH 18 FM tuner, PC's CD drive, Optimus Lineum 4 speakers -- is consequently out of commission. Please help me to get some work done while abolishing the boredom!