@steve43116 I have not worked on this device until now, so I'm only guessing. My ideas:
* There must be some type of overpressing valve. Perhaps this is the culprit.
* A second possibility could be a broken solenoid valve.
* I found an [link|https://www.home-barista.com/espresso-machines/breville-dual-boiler-bes900xl-no-pressure-t71989.html|interesting discussion].
* This [link|https://youtu.be/abneaIJE63M?si=9nXmE47KppX4Ud6F|Video].
* And of course [guide|40279|our guide].