I don't think you can drop the tank with plumbing connected. You might try getting an endoscope camera and taking a look, with and without water running in shower. I got this one on Amazon for about $30.00. Hooks up to my phone.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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