Hello good people, Im working on a 2220 right now. Its in good nick, but the left channel is almost nonexistent. Only when the volume is maxed out to you begin to hear any sound, and when it does come through the signal is quiet and extremely distorted. It sounds like an output transistor issue but I used a DBT, and its not lighting up. So far I have done a good clean of the knobs and switches with deoxit, done a quick double check of the output transistors with my MM (Done in circuit, measurements were the same for each) and checked/adjusted the power amp bias (its bang on now). So now I'm starting the search for other possible causes of my woes. Please help me out with your thoughts and guidance!