If youre lucky, it could be an overtemp cutout or an element, but its most likely the element relay which is a component on the control board. Seems youre proficient with a multimeter, so with the machine unpowered, check the element for resistance and reset the thermal cutout on top of the boiler. If you have no success, then its the board.
If it is the board, it will probably need a partial rewire as there are some differences.
We can do the job for you as can 9Bar Espresso services.The job takes 1/2 hour or so and if nothing else substantial is required, we do it same day.
Hope that helps ;)