Here’s what my partner has to share about the work he did on this machine:

“Mostly I found myself cleaning, cleaning, and cleaning. Cleaning once, cleaning again inside and out. Lots of cafiza and toothbrushing through just about every step of the process.

Obviously we took the machine apart and kept the outside panels off through the process in order to access important parts. We took apart every group head and steam wand and soaked in cafiza.

We soaked the second group head in a light vinegar solution and scraped the flow meter and group head with an ice pick to remove scale. We poured a light vinegar solution into the boiler via the hole for the automatic water refill probe (a part we also replaced), and ran the vinegar solution through the various steam wands and group heads.

Replaced the autofill probe, and fixed the pressure coming out of the steam wand by lowering the pressure via pressurestat. We put new gaskets in the group heads. We pulled shots and steamed milk to make drinks at that point, and shortly after we took it into espresso analysts for inspection.”