I took out the Sonotone and replaced it with a JJB in my Martin GPCRSG. The pre-amp popped right out with a putty knife. There have been a few reports here of the tuner falling out with the Mx-t, so that's just as easy.
The battery box makes the job a lot easier since you can unbolt it and work outside the guitar. I just unscrewed the output jack and put the new one into the now empty battery box. The battery clip clipped right out. A new one might clip right in, but I don't know for sure. If you're not compfortable resoldering the wires, maybe you can have your tech do that for you.
All in all, it's a very easy job to do!
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