With its volumetric dosage, convertible portafilter (pressurized or non-pressurized, depending on how you roll) and high cup clearance, there was a lot to love about the Sirena. Originally produced for Starbucks by Saeco, it also had a long and glorious life on the market as a refurbished espresso machine once it was discontinued. If you were lucky enough to get your hands on one and it met your needs, you might want to take extra special care of it as there's no way to pick-up a replacement. Part of that care is a regular tune-up -- a thorough descale and the replacement of some of the parts that see a bit more wear and tear. Because this was such a popular machine, we produced a Tune-Up Kit especially for it, which includes descaler, the recommended replacement parts and step-by-step instructions. Interested in performing this tune-up but want to find out what you're getting yourself into first? Check out Brendan's walkthrough of the process in this how-to video.