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Make sure you use a new drain seal ring and properly torque the new plug.
I've had this before, in the shop days. Would use a chisel bit on an air hammer, kind of hitting the edge of the plug in the direction you need to go (CCW) and would normally loosen it fine. You could try this, as I have, with just a hammer and chisel. Sometimes some nice flat hits on the head of the plug with a hammer will help jar it a bit too, worht a try.
Gilly
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