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Barista Express - slow leak? How to investigate/repair?


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Hi all - happy to have stumbled across this forum! Especially since lockdown has given me time to get back into my coffee obsession.

I have a Barista Express machine that sadly seems to have recently developed a slow leak :(
It's ~6 years old, was used maybe 5 times a week for the first 2 years, likely a lot less in the last 3 years while my parents were looking after it.

The machine works, still pulls a decent shot and steams milk, but over time is leaking from somewhere near the back. It doesn't seem to leak faster while extracting, but if I forget to empty the tank straight afterwards, sometimes it will leak a tiny bit over an hour or 2, other times it might be a bit heavier/faster leak. I tested the tank by itself outside of the machine, and it didn't leak. I'm currently emptying the tank after every shot and have the machine on a plastic tray to collect any leakage.

Does this sound like a seal/o-ring? What would be the best method to investigate? Are replacement parts easily/cheaply available? Hopefully it's not something broken internally...
The machine is out of warranty (both geographically and temporally), and Sage/Coffee Classics refused to help as the machine is technically Breville branded (rather than Sage), as I brought it over from Australia - just in time for lockdown. I had thought the machines were exactly the same bar the branding...

I've added some photos below in case it might help diagnose.

Many thanks in advance!

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Tank seal and the bit it attaches to

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There are a few trails of scale dripping down from where tank attaches. It's actually white, but the photo lighting makes it look dark.

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Back right corner, rusted from being left sitting in water the first time :( Back left also has a little rust, but front ones are fine.

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I should also mention that I have been following the included instructions re: decalcifying with vinegar+water. It probably wasn't such a problem in Australia, but the water here in the UK is a lot harder. I have been descaling more often, but since joining this forum I see the advice has changed and Breville/Sage no longer suggest descaling with vinegar?

Should I look at getting some Dezcal from amazon instead? Or are there other better decalcifying options? (Preferably cheaper than the ones Sage sell)

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