Thought,
You do the pressure test and all is good. Have you changed the cap? It’s the only thing not in the equation when you pressure test it.

I understand that hot/cold can make leaks elsewhere but a new cap is not a lot of beer tokens :).

J
I've not noticed any leaks or puddles around the cap, so I hadn't thought about replacing it yet.

It does sometimes screw on funny, so maybe it's worth a punt for a few quid
 

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