New Moto Guzzi Door Mats Available Now
They are right- you need to depressurize the line. However, don't feel bad if you demo the fitting. They are a POS anyway. I went to the local autozone and bought a generic replacement for $10. Much better construction and fits onto the same barbed male fitting. You'll be glad you did.
I had some issues as well and once removed I went this route:https://www.beemerboneyard.com/cpcqkdiscon1.html