The leak is like your "OPV" if you are familiar. I do not think that your machine has an adjustment, nor would it help for this. If you know about OPV, think of the leak as the OPV adjustment set at some low pressure, say 5 bar. That means you get 5 bar to the puck and then the leak is the path of least resistance, not the puck.
The prior "fixit" link and part list should give you an idea of work involved and prices. It sounds like a boiler gasket as you noted. The boiler is stainless and should clean and descale easily when apart. I would bet that the parts place knows which parts are commpnly used together.
If you like this kind of project it could be fun, and if not, decide your budget and desire to upgrade. You can walk through the fixit link and see the process and tools involved.
Sounds like a boiler gasket failure to me. I'm not too handy, and I managed changing the boiler gasket on my Starbucks Barista Athena. This is not a difficult fix, nor is it expensive; just a little time consuming, that's all. Just don't be afraid, and take your time. Label all the wiring before disassembling, and take lots of photos before and during the process. Any problems, just post here for guidance.
Had this exact same problem with same machine. Because of the insane amount of corrosion the leaking water caused over the parts inside long term, the machine turned into a parts machine and the frame is still sitting out in my patio. If there isn't a lot of corrosion and the bolts look good, grab yourself a new boiler gasket. These little Saecos are pretty much disposable, but the amount of similarity between them internally is staggering, so getting parts is fairly easy.
I ordered from espressocare.com, a new boiler gasket and grouphead gasket.
I took the machine apart and cleaned/descaled the parts. All looked good. Replaced boiler gasket and grouphead gasket and put machine back together.
Then I tried to pull my first shot and realised there was nowhere near enough tension - the portafilter is very loose in the grouphead.
Did I do something wrong? I cleaned the inside of the locking ring which included what looked like coffee grounds or remnants of gasket. Is there another part that I don't know about - another gasket perhaps?
I looked at the replacement brewhead gasket and they looked identical so I never gave it another thought - I suppose its possible I got a bad one.
Totally stumped - I was pretty methodical and don't have any parts leftover...help!
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