I stated in the initial thread that I had a similar problem with my 7200s with a similar solution. That included changing one electronics board (DSP, amps, etc).

Now I will now add that I changed the board myself. It's heavy and therefore difficult to handle but the connections were simple for the non-electronics person such as me. The board sits in a separate compartment at the back of the speaker compartments. You don`t see the speakers. The speaker wires between the compartments make the connections.

But my strong advice is Do Not Enter! Leave it all alone. A risk is taking out too many screws at the back to enter and the board could drop down.

Also I was sent and swapped the small cable connections module at the bottom. The one sent did not work so I replaced the original module.

All that was part of all the too many problems I had with my first ever M purchase. Never want to go through all that again.

But I try and forget all that and I do enjoy the music from the 7200s from the 808.2. It`s absolutely beautiful!