PTU takes 1.1 pints of 75w 140
There is no drain plug.
Fluid has to be sucked out manually from the fill plug near top of the housing.
Then replaced with the new fluid.
I believe fellow EBPF member crash712us has pointers on performing this service.
If he doesn't pipe up soon enough, shoot him a PM, linking him to this thread, so that he can perhaps post the info for all to see.