Oh, don't do that. The faults you got are from you trying to start it with the manual park release pulled.
Do you or do you not have signal at the starter?
I do this for a living.
They are correct, replacement is very rare, and they actually have no idea how to fix them either. They will send you through the corporate shit show of software update, valve body replacement, then backorder a trans.
You might get lucky and get a valve body to fix it...
When working on an engine, the front of the engine is where the serpentine belt drive is, the rear is the transmission. The right side is the passenger's side of the vehicle. Bank 1.
Eh, should be pretty straightforward. If it is under warranty, it gets replaced. Have you been off road recently? If so, clean the crap out of it and make sure there is zero trail damage.