I have a local coffee shop asking me to consider adding expresso makers to my repair list. It seems that most are rented with service but several in town have older purchased equipment and closest person lives 100 miles away and charges mucho for travel.
I haven't really looked at one but it would seem that access and parts would be the only learning curve. The rest is fittings, pump, elements, heat exchager, tstat and controls and should be relatively short learning curve.
Anyone ever tried to work on one.