it sounds like you need a new group head gasket, or the group head gasket is not installed properly.
If it is a new machine, you probably just need to reseat the group head gasket. If it is a used machine, the gasket is probably worn, they need replacement every 6-12 months.
The Starbucks Sirena is made by Saeco, and is also called the Saeco Sirena.
You can find the group head gasket (brew head gasket), and any other parts from the following:
seattlecoffeegear.com Here are a few videos of the machine in use:
http://www.youtube.com/SeattleCoffeeGear#p/search/3/6QlOKdAhElI
http://www.youtube.com/SeattleCoffeeGear#p/search/1/U8Lyomhq92Q
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