If you choose to do auto repairs on your MZ SX 125 Enduro then it is always recommended to have access to a Workshop Manual for personal reference in the event that you need to know proven methods to take off a specific part including Door and install it again in the correct manner.
MZ SX 125 Enduro Workshop Manuals provides identifiable diagnostic info for the vehicle therefore if something is broken it will help you identify what the situation is and ways to resolve it. You will be able to decide if you can do this by yourself or in the event the job is just too big you can actually make a reservation for your SX 125 Enduro right into a nearby friendly mechanic.
MZ SX 125 Enduro manual