As the others have noted, between design and materials, there's no good way to get them apart/opened up. There's no reason to think that there's anything complicated in there -- the dead spot you're experiencing is even a little surprising -- so it may be a matter of some water got into it, either rainwater or condensation, and caused some corrosion that is breaking the contact in that one point.
Before trying to crack into it or buying another, I'd pull it off, try to get some solvent (WD40, electrical parts cleaner . . . ) into it, around the shaft and under the button,, and spend an evening or two working the button in and out from time to time while watching TV over a couple evenings, with regular additions of more solvent/cleaner, to see if you can break the crud looose and get it back working properly.
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