Fan is obsolete on these too. I've had 2 just recently who've had to replace the boiler because of a duff fan. One just before Christmas!
Photo of what?
You don't know the twin pump 350 with single PCB and electronic ignition?
Well.....I guess it would suit you to delete your posts due to mis-informing the OP......
In view of your negativity I am inclined to delete my previous replies to you in case any of them encourages you to continue with your attempts to do DIY repairs on parts of your boiler you should not be accessing.
Tony
There were several different models of the 350.
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