La Pavoni Europiccola Manual Lever Espresso Coffee Machine

This coffee machine was passed down to me and still works. I have attached a video showing that it is working fine. I am however confused about what the second button does underneath the power/red button. I couldn’t figure this out Bought from Fairfax (Famous kitchen shop in Swiss Cottage, London) in early 1990s. Used daily for two cappuccino. Serviced by fairfax early 2000s. Not used regularly for last 10 years or so. - Original portafilter with cracked handle - Replacement with single spout

eBay