There isn't a whole lot to those ecm controls as far ad parts go. A chip senses current and voltage at various places and commands a few power transistors.
The stickler is how the elements are housed: some manufacturers take the extra step of encapsulating the control in epoxy. These modules are impossible to service at the component level.
The video mn renovator posted was all about the ptc thermistor. It looks like this is the mandatory current limiting device described. The failed one in the video can likely be repaired by soldering the leg back onto the body with silver solder. Old school crt displays had one of these wired in series with the degaussing coil to demag the screen on power up. I have no idea how many of those things I fixed, but it was a lot.