I picked this up yesterday, the guy did house removals so that's where he got it from. He didn't know anything about the origin, but from first looks the previous owner didn't know what hard water can do to a coffee machine. Pretty cakey overall, the leak is caused by the fact the plastic hoses held together by a plastic T-piece were completely worn through and snapped of a crusty T part which made both the steam/coffee boiler over-pressure valves leak into the machine. There is definitely some rust at the bottom of the machine because of this. The solenoid looked clean, but the top of the mushroom has some chalk spots around it (haven't gotten to the part of opening it).
The steam boiler did actually work, it just was turned off using the switch underneath the drip-tray so that's a plus. I'll need to prime the pump though as it has been run without water, also ordered new tubing and the t-piece so hopefully can have another stab at getting it running next week, and try to do some cleaning before that. Might take a peek into the coffee boiler to see if the scale is really bad.