Not sure if slater posted this yet, but hopefully I'm not spoiling his work
. I went ahead and fixed my out of phase BT10's.
For TRN BT10 Out Of Phase
* You will probably need a decent soldering iron with a small tip and some needle nose tweezers. These are extremely fragile small gauge magnet wire.
Open case with the buttons and take off the side with the microphone. You can do this by squeezing it, using a plastic smudger/pry tool, or do the stupid things I do and put it in a pair of pliers and gently squeeze until one side cracks allowing you to pull up the case. Once open, the fix is fairly trivial, simply first double check which side is out of phase and then swap R+ & R-,
or L+ and L- (circled in the image). There is no need to touch B+ and B-. The case should snap back together when finished. Make sure to align the rubber grommets so they sit inside the case, and make sure to check that the mic hole aligns with the microphone (grey component with holes on the board).
Another interesting note, I didn't see these doing AAC at first, only SBC...they've since linked up to bluetooth using AAC and sound great. My Pixel has aptX but I don't think it sounds any better than AAC.