So I've finally pulled apart an old and problematic BES860 (very low steam pressure and some water leakage near the group head), and found the problem being a leaking o-ring on the tube going to the steam wand. I replaced it with the steam wand's o-ring to see if that fixed the problem, and sure enough it did. Hurrah! First up, does anyone know what the spec size for the respective O-rings is, and where to get them? Is the steam-wand's the same size as the tube's o-rings (they look about the same, but I presume age would change their size a little). If I can't find an 'official' Breville replacement, is there a generic I can use instead?