Maybe this has been answered before, and maybe does not belong here, but why is there so many different motor control boards for the TMCC engines made over the years? I just know in any repairs I have made, I had to make sure the "correct" motor control board was installed.
But here is the confusing kicker (at least to me), I now see the same ERR boards being used as replacements to various motor control board installs. Any help to my education would be appreciated.