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In my example, it was leaking after I replaced the gasket (didn't touch the element or pstat), and was resolved after I tighened the boiler ring.
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Are you certain? I bought one with enough of a leak that rust had pitted the entire underside. I replaced the boiler gasket, which had hardened substantially and needed chiselling off, and there's no leaks anymore.
Edit: this was four years ago so could be misremembering but, like @mmccarthy, I don't remember touching pstat
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It seems it'sealing between the black plastic base and the metal "ring"
mmccarthy
Ptown
anidel
@Kalkhoff
The only way the base ring could be making it leak is if it actually was able to spin free, which it can't do as the element and electrics are bolted to it. It can loosen a little (boiler can sometimes have lateral movement when it's warmed up) but wouldn't be the cause of the leak.