Hi Joseph and welcome to CoffeeSnobs....
Well you were lucky - sort of!
As an M20 owner myself I can help a bit.....
Manuals.... never been able to locate one! I have M27 and M28 manuals but they arent a lot of use with this model. All La Cimbali model manuals are hard (near impossible) to find......
These machines can be heated with Gas as well as electricity..... The panel will often have the label even if the gas burner isnt fitted (you will see it under the boiler)....
There arent any fuses but the machine can be wired for single and 3 phase power (not sure about the single group)..... The second position on the power switch is the heaters by the way.
I suspect you might have either a blown neon globe (so no red light) or a faulty main switch or wiring problem.... best bet is take it to an electrician.... electricity, water and lack of knowledge is a lethal combination..... and can prove terminal!
Parts can be purchased online from CoffeeParts (a site sponsor). ... who do mail order shipping. (Guess it depends where you live as they are an Australian supplier - there are also suppliers in America and of course in Europe)
Good luck!