B,
It sounds like the drain line from the kitchen sink to the shower, or the T where the bathroom meets the kitchen drain. The pipe from the kitchen is attached to the inside of the wall up kinda high, with a slope to the tank. If you were sideswiped on the same side as the kitchen this is where I would start.
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Brett G
WBCCI #5501 AIR # 49
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1978 Argosy 28 foot Motorhome
Wise men talk because they have something to say; fools, because they have to say something. -- Plato
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