If you wish to perform auto repairs on your PGO BuBu 100 then it will always be a great idea to have a Workshop Manual to keep just for a guide in case that you need to know tips to strip off a particular part for example, the Gearbox and fit it again successfully.
PGO BuBu 100 Workshop Manuals are able to offer certain diagnostic info for the car so if something is playing up it can help you find out what the situation is and tips on how to correct it. After that you can assess if this can be achieved on your own or in case the job is too big you could make a reservation for your BuBu 100 in with a suitable friendly mechanic.
PGO BuBu 100 manual