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Double Bass AI problems

I have dreaded the day that something would go wrong with my 2-channel series 4 Coda ever since Rick Jones passed away. Rick was very generous with customer service. He always walked me through any issues that occurred or sent me replacement parts free of charge. Recently, on the way to a gig I noticed the limiter switch was very loose on the back panel of the head. Something must have banged into it. During sound check, the DI on one of the channels was not working. The FOH said all he was getting was noise. Later that night I opened the case and found that the limiter switch assembly had come apart. I asked a friend, who works for a guitar pedal maker, to see if he could put it back together. He was able to reassemble but the DI still doesn’t work on that channel. I looked everywhere to see if there were any loose connections. And I cleaned all the inputs. After cleaning the DI worked at home but not on the next gig.
I’m at a loss for someone who can work on this head. Any ideas or suggestions are welcomed. In the meantime I’ll be using a backup AG 700 but not a doubling setup. Luckily no doubling gigs until the fall.