Not a bad DIY Rancilio project
My Miss Silvia was pumping harder with poorer results.  I could have had it done at my local repair shop, but I decided that it was most likely an old pump whose springs were more or less worn out.  It was a quick and cheap replacement.  Highly recommended.  I read many reviews and made sure that I tightened down the hoses before closing everything up.  Do test it before you start putting the housing back together.  Leaks are unfun to have to treat, once it's all back together again.
Rating: 5 stars