Most coffee technicians know how vital it is to get a broken espresso machine back up and running. Without the machine, the café cannot create the drinks that drive revenue, tempers flare as the whole cafe goes into cardiac arrest, and a tech walks in and starts pulling the machine apart.
But as stressful as that can be, having a roaster go down is an entirely different level of problem. Now you're not worried about disappointing a regular location; you face an existential threat to the entire business. Wholesale customers will walk, eCommerce orders will turn into customer service time bombs, and a whole labor force will be idle while this most crucial piece of equipment is serviced.
True expertise in roaster repair is rare. But many simple roaster malfunctions have relatively simple repair pathways open to the well-rounded tech.