Hate to break it you, but they don't come with a parts break down. But you are in luck for I am a Cimbali service agent. If you have a 2 group. You will need all of the following.
2 Group O-rings (Metric 5 Alan wrench and a 10mm open end wrench)
2 Shower Screens
2 Steam arm rebuild kits (18mm or 20mm open end wrench)
2 Steam Valve rebuild kits (You will need C-clip pliers)
1 Vacuum valve, often referred as the gravity valve or anti suction valve.
1 Gasket for Vacuum Valve
Of the more complicated items you will also need.
4 Flow restrictors (or referred as jets) (1 for each group, but you also need 2 more, one for the fill system and one for the hot water tap.)
4 screens for the jets.
8 copper gaskets for the jets. (each jet has one on the top and bottom.)
For the above you will need a 17mm and 20mm open end wrench.
Items you may want to carry spares of:
Pressurestat
Level Probe
Procon Pump
Safety Valve or sometimes referred as Overpressure Valve.
I’m am not responsible for any damage that you cause to your machine while trying to maintenance it.
