If you wish to accomplish adjustments on your own Orion APL50QL then it is usually recommended to have a Workshop Manual to use as reference should you want to know the right way to strip off a specific part much like the Drive Shaft and match it again in the correct manner.
Orion APL50QL Workshop Manuals are able to offer specific diagnostic wisdom for the vehicle therefore if something is broken it will help you determine what the problem is and tips to repair it. Then you are able to assess if you can do this by yourself or if ever the job is just too big you are able to book your APL50QL into a decent garage.
Orion APL50QL manual