If you need to perform maintenance on your TGB Keywest then it is usually recommended to have access to a Workshop Manual for a guide in case you need to know the way to strip off a certain part for instance the Gearbox and match it again correctly.
TGB Keywest Workshop Manuals provides unique diagnostic info for the vehicle therefore if something is wrong it helps you determine what the problem is and the way to repair it. After that you can decide if this can be done on your own or that the job is too big you are able to book your Keywest in to a suitable repair garage.
TGB Keywest manual