The Story . . . .
A customer brought in his minivan with about 70,000 miles and the transmission would not shift and was stuck in limp mode. The transmission repair shop did their initial diagnosis (I assume) and then removed the transmission to be rebuilt. After the rebuild was complete and the transmission reinstalled it still would not shift. The shop owner decided to take the vehicle to another transmission repair shop for their help since there was a technician at that shop who had a "fix it" reputation. It seems both shop owners were good friends and helped each other out from time to time. The make and model of the vehicle does not have any particular bearing on this story and the ultimate fix. Let's consider this a family (generic) minivan with a transmission that fails to shift problem.

The owner of the second shop told the R&R tech to pull the transmission and take it to "Mr. Fix-it" in the back, by the name of Larry (not his real name but I want to keep him humble). Larry took charge of the situation and moved the vehicle to the back area and told the group in the waiting room to hold on a few minutes. If you were Larry, a great tranny rebuilder by the way, what would you do?