Not gonna lie, you did make me laugh. All jokes aside though you are very correct in how some dealers go about their business, I was really hoping mine wouldn't do this to me, but they did.
You are correct that the TCC doesn't seem to be locking up when commanded to. I have replaced the valve body and swapped the TCM with no change in symptoms. Same code, same behavior.
The previous owners did a lot of hill climbing in this vehicle. I know this because the previous owners were my grandparents, and then my mother, and then my uncle. My grandparents lived about 30 miles from my home with a majority of the drive up and down very steep roads.
My mother, the same thing, just the opposite direction of where my grandparents lived. A good portion of the drive being pretty steep up and downhill to and from. My mother was also the caretaker for my grandparents before their passing and used this Subaru a lot to drive them around to doctor appointments and what not.
Then my uncle would drive a lot of highway miles plus the hill climb and descent to visit and aid in caring for my grandparents after my mother had to become my grandparents full time caretaker.
So as far as previous transmission issues I'm not 100% sure. I do know that my mother said the car is gutless going up and down the mountain to her house. That's about it. The car itself has been solid up until just recently. One morning I started it and the CEL light came on and the transmission began acting as I described in my original posting. That and the tachometer was inoperative as well, with the rest of the instrument cluster functioning but I'm pretty sure that has nothing to do with the transmission.
I did actually find the FSM for this vehicle, but to my chagrin the FSM seems to show the vehicle as having the phase 2, version 2 valve body. Mine has the phase 2 version 1. So I've been looking at the previous year model but it seems the only FSM I can find is for the Euro model, and the codes appear to much different.
All in all I'm pretty lost, hence why I'm here.