you can cut it off at the wall, then notch the nipple in the tee in the wall with your sawzall, chisel it out, and then re-tap the fitting and then go from there with material of your choice.
or you can open the wall and cut tee out of wall and then slip in a couple fernco couplers or no-hub cast iron couplers with a new tee.
of course you could order some leakender 2000 off tv, that tv stuff is always good.
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