We recently bought a a 1964 split level and the drain in the bathroom one level up (about five steps) from the kitchen has always gurgled a bit when you use the kitchen sink or dishwasher, but tonight after doing a huge sudsy sink full of dishes my daughter reported the bathtub had bubbles coming up from the drain! Is this obviously a vent issue? I don't even know where the main vent is! water and bubbles traveling against gravity can't ever be good.....Any help would be much appreciated...
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Bad gurgling sound takes a turn for the worst...