I've dropped my beloved headphones and the left side is dead. Without any audio playing I can hear a rattle when I put them on and tap the headphone. I've tried switching the wire to the good side and no dice. Is there any DIY solution here or is the driver damaged for good? There's one teardown video on youtube but it's in Indonesian and I'm not seeing the guts of the driver. Anyone know what's inside and what to look for if I do a teardown? So bummed.