You might find a harness damaged that supplies the trans controls.
The severity of any damage would affect how much of it needed repair.
You need to run tests in the proper order. A smart gamble... remove
the harness, pull it up where you can get at it to repair it. google for
your vehicle, look at the repair looms offered. there can be one you
could pick to install after looking at their photos. Or of course, mr.
goodwrench can help and knows what to order after he completes the
proper tests in the proper order. There was a lot of speculation and
conflicting diagnoses available last time I went through this one.
Guessing and slinging parts at it costs more money and time than mr.
goodwrench.