Yes, I agree. That's why I'm seeking out the advice of serious professionals. I studied the board and asked Carrier hoping to find the date of manufacture. My thinking was that would be the easiest way of proving out (or disproving) my concern. I would much rather go that route that placing this board into the unit and seeing what happens. Then, it will likely show evidence of having been installed and my case becomes weaker.
Setting aside that the 3 amp fuse also looks like an E, do you know of a way to determine the date of manufacture? Or in the alternative, some other approach I might can take to allay my concerns?