As stupid as this sounds coming from a brand new pair out of the box where the left earbud didnt work, I had to read and find the source of the problem..Here is what I found..
Following the paired instructions, I found that to help yet no sound in the left.. I squeezed the left bud and had sound until I let go.. I took the handle of a screw driver in the spot I squeezed a couple times and it now works without squeezing it..
It is indeed a wiring problem.. Being an IT Manager for 18 years, trouble shooting anything never required smacking it with a screw driver, but is now in my arsenal of a possible fix.. Needless, I found they are not worth the hassle and days worth time spent..
Hope this helps someone as it did me.. Mine now sit in the case fixed and never used as I went back to a cheap pair plugged into my phone that never fails..