• Experiencing near identical problem
  
  
  I also have LIST showing; when I press Up, 2, and Display simultaneously, and then release, the display shows TEST very quickly, then shows 5. I sent it to All Electronics Repair with a clear explanation and all they did was replace the power switch. It still doesn't work and I'm stuck.
  
  
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• try this
  
  
  This could be a 2 part problem. 1. It could be one of the speakers causing the problem. You can disconnect the bundle of black wires on the back of the master. Be sure you disconnect the separate patio black if you have one. If this solves the problem then hook them up one at a time until you find the bad speaker. 2. You could have a bad talk or listen switch on the master which could cause the problem or you could have them both.
  
  
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• My M&S MC350A
  
  
  It's working. Even the door bell.
  I followed your instruction in "try this" with an excellent result. THANK YOU SO MUCH.
  Karl
  
  
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