Thanks. Was very happy with the result. Machine is very well built so that really helps. Also all parts are still readily available if needed.

@@dracwong My name is Alex, in Brazil I work for La Marzocco, I've been a coach since 2013 and a Barista since 2004!

@@dracwong I take care of technical maintenance

The citric acid bath is around 50% concentration heated to 75deg C to speed the process along. Its a weak acid so even at this concentration its very safe to use. You just need to be really careful with the shiny plated surfaces but I was not fussed. Cleaned out all sections with soft metal brush and pipe cleaner as well. All the brass/copper boiler parts polished with soft wire brush wheel on bench grinder unit. The stainless panels were polished with metal polishing paste on cloth polishing wheels but this was a lot of work. I would outsource the stainless metal polishing next time.

Most of the cost was in time. All parts were reasonably cheap and readily available. I did get some temp probes made up by a local instrument engineer which was the biggest cost.

@@dracwong I had to replace 5 tubes. A big local cooling company was the only one I could find that could silverbraze copper. And, they did not charge me!! After 10 leaks and other issues under first upstart, I have a 6L HX boiler espresso machine! And I have the knowledge to fully maintain it! But, it was not a first lv restauration like you did.