Smoking gun found!
With the trans pulled and cleaned it's time. I use a long drift to drive out the two pins where the two halves of the trans mate. I heat up the case first to loosen them up a bit and add a little penetrating fluid. They take a considerable whack to move so the heat seems like a good idea even though the manual makes no mention for this step.
Next order of business is to heat the bearing points in the rear cover. I use two heat guns for 15 minuets. No soup yet.
This laser temp reader takes out the guesswork.
After about 30 minuets I'm reading 170 degrees. I decide to give it a try. The back half of the trans slips off easily by hand. Sweet!