Same here after I dropped it, 2 years warranty this was a replacement for a dropped Jbl Charge 1, it was replaced instantly at there service department without question, I dont think i want to open it to take a look in case they dont change it again, if only i can find the receipt....
There is a teardown in french on youtube but i cant even get the ends off.
https://www.youtube.com/watch?v=IElTLOlAGMo