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The first question is has anyone been pouring grease down the drain? Second is has this happened before?
I would suggest going to the hardware store and getting a cheap snake, and a bottle of cleaning enzymes. Pull the trap out and make sure it is clear, then run the snake down the rest of the drain and see if you can get it that way. If that gets it, then put everything together and dump the enzymes down there to break the rest of the crud loose.
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