Hello everybody. I am new to this forum. I have the same EXACT problem. I have a 2016 214e DLX. I had already brought mine in to be checked, but the problem was not solved. Before i brought it in, I changed the D string as I thought I had a bad string. Not the case. Then I proceeded to tighten down the tuning pegs and well as make sure the bridge end pins were seated properly, which they were. Still not the solution. I called Taylor and then they told me to bring it in. When I got the the Authorized service center in my area, they said it was because the neck was bowed. So he adjusted the neck and he said the buzz went away, but I think we just could not hear it due to the ambient noise in the store. So I get home and started to hear it again. It was really bothering me. The noise absolutely sounds like it's coming from inside, near the neck and most especially by the volume and tone knobs. So what I did was I squeezed my hand in the sound hole and put a little pressure on the circuit board itself, and the noise went away... So I call back the service center, he said it's highly unlikely that its the circuit board itself. He told me to check the wires, but not are loose.
I am glad I saw this post because I can now show this thread to him, they change out the circuit board and hopefully the noise will be gone. This should be covered under warranty correct?
Thanks to those whose have contributed to this thread.