Ours is 11 years old also, and we did have a very small leak last fall.
You could/should use this
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
and then you could fill the toilet with water and see how it did.
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TM: 2007 2720 (QB) TV: 2010 Toyota Highlander Hybrid
Hopkins INSIGHT brake controller, Andersen No-Sway WDH
CARCHET Solar Powered TMPS
Dometic CRX-1110 AC/DC Compressor Fridge, 200 W Solar
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