So my 10-yr old (non-electric) toilet bidet started leaking today. It's leaking on the underside of the control knob (see pic) so somewhere internally. It only leaks when it's on, and not too badly so a bucket and towel underneath for now. I haven't opened up the control box yet (because it gets extensive use - the less you know the better) but I found a mfg picture of the internal, see attached. I'm guessing the black gasket has gone bad. Has anyone ever tried to repair one of these things? Not clear to me how to access the gasket so any tips would be appreciated. I've ordered the newer model (slim version) just in case I can't fix this one. Thank you.
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