Are you saying that the end of the plug is broken or twisted off?? This plug is fairly similar to the drain plug in the pan. I can't imagine how that piece could come to be separated from the threaded portion w/o a lot of torque being applied. If this is true, then someone or you will have to carefully drill a 3/16ths deep hole in the center of the plug and back out what is remainig with an easyout. The 12 point will not work unless you have the 5mm hole available. There is a distinct possibility you may have to remove the tranny and torque convertor to repair this problem..
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.