Google. "ecu repair specialists uk" brings up a good list.
Looking for things heating up in the ecu isnt probably going to work as youll tend to find that only happens if a component failure leads to higher current being passed to a component thats not able to deal with it, so heat, smoke and fires!
What youll find for example is, say an injector has apparently failed to fire when it should.
initially most folks would think the injectors gone bad and that does happen, but if the injectors ok and functional then you can check for a signal to the driver ( its basically a power transistor bolted to the case to sink the heat out of it) and see if the actual driver is getting the signal to fire the injector.
If the drivers gone down (also happens) then although youll have a signal to the driver of a small magnitude( cos the transistor amplifies the signal to run the injector) therell be no output signal to run the injector which you could teset for with a simple noid light.
Thats just an example of what usually goes on rather than any particular pointer to your problem, id hazard a guess at yours that a dry joint on the board is warming imperceptibly and making/breaking contact or raising the resistance of the joint causing that cutting out issue,that can be caused by water ingress etc or just a bad joint made when the ecu was first manufactured.
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