Prentice the q1 now comes as a kit. The rectifier you speak of does not replace the one connected to the q1 transistor, it is for the other hole. If it was put in wrong he would have code 23. There were so many warranty claims denied by the factory because guys were not checking the drive components just changing the q1 and watching it blow on first key on. The factory's fix was add the rec to the q1 to force people to change it.
The green light on the powercard is current limit enabled.
Your truck thinks it's moving. If you just keep commanding fwd for an extended period of time does code 29 appear?

Unfortunately this is becoming a difficult repair, if I was there I would make sure all the cards are good, try in your other truck. While the power card is out check the transistor modules behind it. You can swap them as well and see of you gain forward and lose reverse. The truck should be coding 26 if a transistor module was bad but I have had scenarios where it won't.

Edit: do not swap display, this is where primary memory is held.