So I could not resist and bought a Topdon TC001.
Immediately I could see that R8 was hot.

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So I then checked the 12V and sure enough I had a short there. I admit I could have just checked this with the multimeter, but not as much fun.
So knowing I already had a bad capacitor, I changed C6 and this also believed it was an inductor.
I changed C81 and C52 for good measure but not sure these were the problem, as they tested OK, and..
Working.
Thanks Mark again, for the tips on finding a short, which lead me to the first faulty capacitor.
Maybe I did not need the thermal camera but it was so much fun.
Will change the rest of the capacitors for good measure.
Rob