Eddy - take off the elbo that leads from the cooler piping to the T/B. On the elbow, follow the red tipped hose down to top of the transmission, and there you will find the solenoid.
I tried to take the bung out over the weekend - fecker was stuck solid!! Couldn't get it out, so now Im just going to run a bleed valve instead and set it to 12psi and be done with it!