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An electronics tech can repair a random failed motor controller. That information should absolutely not be limited to just factory. When I fix cars, most of the time I have to fix broken wires and faulty ground. Occasionally, I have to fix a failed component in the ECU. They are extremely easy to work on for someone skilled at microsoldering, which is not a hard skill to attain.

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It isn't about being able to solder components. It's about just how dangerous it is to work on high power circuits. High voltage makes it even worse. And then, you need specialized test equipment and fixtures.

Source: I used to own a company where we designed manufactured high power DC brush and brushless motor controllers. As a simple example, every motor controller had to be tested for short circuit protection under full load. The power supplies alone were outside the realm of anything normal. The motor controller, power supply and storage capacitors had to be in a custom explosion-proof enclosure for the test.

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