If is anything like my Endeavor, you can remove some of the interior panels and shelves beneath the kitchen sink to gain access to the plumbing. If your toilet is just aft of the slide, and there is any type of ventilation grille or register in the toilet pedestal, you might see something from there, but I think you'll have a better shot at fixing the leak through the sink cabinet.
It annoys me to no end that there is no access panel for that area. Mine is beneath and behind the shower.
Mike
2000 Holiday Rambler Endeavor 40PBD
Freghtliner XC, CAT 3126B
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Mike
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