I always think transistors are either working or failed. I'd do the easy thing and replace the capacitors (make sure you get ones that can take high temperature) like the part number I gave you. And hope for the best. If you still have issues I'd replace the 2 x K591 as these are the one's that take the punishment. I'd then check again to see if it's running right. If still bad, you can replace the others. I actually sourced all these transistors (originals) from eBay from China, but never put them in my FPCU.
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