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Re: Weird hot water problem
I would certainly pull off the shower head in case anything is back there.
You should be able to get inside the tub valve from the front unless they screwed up the tile job - the control mechanisim should just screw in with the ball behind it. If you do end up taking this apart, be sure to plug the drain first, and be very careful when removing the valve stem, as there may be springs/washers inside that you don't want down the drain or falling into the wall cavity. Also, if you do end up disassembling the valve (which isn't a big deal, just be careful), unscrew it gently so you don't accidentally break a solder connection (they shouldn't break anyway, but will if they are marginal to begin with). If you know he make of the valve you may be able to find an exploded diagram which will show you what to expect inside.
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