Several weeks ago I changed the strings on my revoiced Taylor 814 and subsequently got a very strange sound while strumming. I tried to think it through methodically and changed some parts one at a time to determine what could be making the offending sound. These included the newly installed strings, the saddle, and bridge pins but all to no avail. I used an extension mirror but couldn't see anything amiss inside the guitar. I finally gave it what I call the Stevie Wonder Treatment, and removed the strings and carefully felt around the inside of the box with my fingertips. This quickly alerted me to the fact that the top brace just below the bridge plate had come loose and was no longer attached at one end.
I considered several solutions but opted to call Taylor's Service Center. To make a long story short, it seems that there was an issue with the applications of "protein glue" in the assembly of (some of) the early revoiced 800 series Taylors. The good news is that Taylor is installing a new body on my 814 and covering shipping both ways. The bad news is that I won't see my 814 until the end of March.