For other folks, if none of these solutions work... Our Saeco Aroma was leaking too and I found a different answer online at http://pilkin.com/how/saeco/. The brass valve pin that makes the seal had some grooves worn in from daily use. After sanding those away, back to a smooth finish, the valve seats tightly and the leaking stopped. That'll likely be a necessary task every few years until the unit really breaks down.