GENERALLY, sinks drain to black tank and shower rdrains to gray tank on MOST units.
How do you know your gray tank is empty?
If your gray valve is open it MIGHT back feed into your black tank.
I can't help with the flooding under the fridge but you might want to try a plug in that outside sink just to see what happens.
Warranty or not, get to a repair place right now or you'll have plywood problems you don't even want to know what it costs to fix.
Spend the $90-$128 for an hour with a professional.
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