@elmoret
I wanted to post an update since I have of course received the replacement Duet2Ethernet board and I've been working with it extensively.
I have installed it in the FolgerTech FT5 printer and hooked it up to all the hardware that I have. In this case, that's the X,Y, & Z motors, the extruder (I have only one, and it's the stock unit that came in the kit).
I've got the stock bed heater, the extruder heater, the stock thermistors, and the fan that cools the extruder. I also have added a BLTouch probe. I don't have any other fans such as a part cooler, at least not yet.
The board is running everything properly, so it seems. I can do auto bed leveling, and I can run test prints, but there are issues with the prints that I'm going to ask about in this forum, but I'll start another thread elsewhere.
Thanks again for the warranty support. It's good to have a board and PanelDue that seem to be working as designed.