I bought the Haynes "Automotive Engine Management and Fuel Injection Systems Manual" to help me with the car and was rather surprised to find it was actually more relevant to the Ducati! It has a chapter on general theory and one on fault finding as well. There is also a specific chapter on the IAW Weber-Marelli MPi system (also listing which cars have these systems) which looks extremely similar to that fitted to the Ducatis with P7 and P8 ECU's (the connections pretty much match those in my Ducati manual). Doesn't specify the actual ECU used though probably most likely the P8. Certainly more use than the Haynes Motorcycle Fuel Systems TechBook that I also have
Keith