@nullermand_inc, thank you for the question, I had this problem a couple days before till now.
My case turned out to be easy: no water damage, inner power button actually worked. The outer button could not push it sufficiently, I suppose. Pushing it felt normal from the outside, so I could not detect it without disassembling.
@oldturkey03, thank you for linking a guide, it really helped me.
That was my first repair, and I tried to make sure that it still works at every step of re-assembling. The favorite headset works again, I'm happy and grateful for this thread :D
P.S. I also removed the bus connecting the touch pad in the other earpiece. I don't use it much, but it reacted to my hood and stopped playing whenever I wore it. Won't have usable touch pad anymore, but at least my headset won't be under the rain directly again.
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If headphones aren't waterproof or water resistant, water most likely seeped in and might have caused problems. Search for disassembly procedures so you can examine for water intrusion then wipe off remaining moisture and lay out parts either in a gas oven with only the pilot light for warmth, over a furnace or water heater or out in the sun. Any method for warm heat to dry out remaining moisture for a few hours or overnight then reassemble and recharge. Canned air can be used to help blow away moisture too.
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