Try reading the thread at the link below. The addition of a drain plug is a great advance but I didn't waste my time with the fill plug because it was buried down under a bunch of stuff, and the filler tube was much handier. You must use the correct fluid -- read the thread. Also, only about 3.5 Qts. came out the drain plug. To get a more complete change you'll either have to do the dump/fill 2 or three times, or pull one of the trans cooler lines and flush the whole thing out. Since I'm opting for annual changes from about 20k miles, I'm just figuring on living with the 3.5 Qt. swap as being adequate maintenance in the absence of any other problems. Good luck.
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