If you need to conduct auto repairs on your Moto Guzzi 940 Custom then it will always be recommended to have a Workshop Manual to keep just for a reference just in case you want to know techniques to remove a certain component like the Gearbox and match it again in the correct way.
Moto Guzzi 940 Custom Workshop Manuals can offer you special diagnostic guidelines for the vehicle therefore if something is playing up it can help you work out what the issue is and how you can correct it. You will be able to analyse if this can be achieved by yourself or in case the job is simply too big you can still book your 940 Custom in to a local friendly mechanic.
Moto Guzzi 940 Custom manual