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I've ordered the new part anyway - so I'll be able to see the required resistor on the new board.
And tbh, the guy at https://www.espressounderground.co.uk/ was super helpful on the phone with advice for fault finding. I feel satisfied enough that I've located the fault and ordered the new part. Also ordered a replacement pump for my Gaggia while I was at it.The PCB is on back order, but pump should be in the post today.
Can you desolder it and check the bands underneath the resistor where they might still be intact?