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Should just be the pad seal in the tap, usually pretty straightforward to dismantle. If you can get the seal out without destroying it you can just turn it around and reinstall.
Edit, not that straightforward it turns out, but doable. Good guide here.
https://singletrackworld.com/forum/topic/gaggia-classic-owners-leaking-steam-valve/
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I got round to doing this. Took 10 mins to file off enough of the body to unscrew the needle and pop out the washer. Cleaned it all up, but it still leaked. Put some plumbers tape on the thread and hey presto! it stopped the leak.
It might not last, but at least now I can just unscrew the needle and add more tape without having to completely remove the assembly.
I’m guessing that once the steam valve tap on a Classic starts dripping right out of the tap itself once you open the valve a couple of turns, then it is fubared and non serviceable?
Have descaled a couple of times with no joy.