To follow up, my ECU IC is NOT socketed, although there is some evidence of heat from a rework station. So, "alleged" is the correct expression, although the other mods in the documentation exist, such as those done to the SLABS.
While I have replaced ICs before, I have never done one with that many fine pins, and so I am reluctant to attempt it here. I will continue to look for another MSB101340 to play with. Of someone with a NNN 130 that they don't know the value of [bigwhistle]

