Thank you so much for the great information. I will try to use the search feature better as well.
I (think I) understand that this machine is somehow not quite an HX, and appears to have a single boiler in it, that somehow pulls steam from the top and water from the bottom, with some magic at the group head to maintain a constant temperature.
Upon closer inspection, I notice the the power wires that feed the boiler seem like they have gotten very hot, the insulation seems crisp and browned on the larger (power, I assume) wires.


I also figured out that the machine uses 2200Watts. It has a huge line cord, yet someone put a 15A plug on it. I plan on replacing with a 20A plug and sharing the circuit with the rarely used electric range.
I am hoping that low voltage to the machine was what caused the (apparently) over-current problem to the boiler power. I can replace the melted wires with new wire of correct gauge and insulation composition.
Is there anything I can easily do to inspect the boiler heater element and the tank? Am I better off just trying it out after replacing the wiring.
As far as back-flushing and cleaning out the group head etc. The manual I printed out from the LaSpaziale site seems like a catch-all "Barista" manual with "end of day" cleanup and "every 2 week" maintenance.
It doesn't seem to have important things like a schematic diagram of the electrical, or a BOM/parts list. Does anyone have a suggestion on were to get something more akin to a "service manual" for this specific (family of) machine(s)?
Thanks again for all the help. I have my work cut out for me.
Sean