Shelly, I also had my genes tested at 23andMe. You go to "My Results" and then you select "Health risks". Then you get a list of all the diseases for which you got a high risk. If you have parkinson genes, you will see parkinson's disease in that list. You click on "parkinson's disease" and a new page will open. You scroll down untill you see "Marker effects". There you see the most important parkinson's disease genes: LRRK2, GBA, SNCA, MAPT, PARK16, BST1, DGKQ, STK39. Now, for each of this gene there is a bar set. If the bar is green, the gene is safe for PD. The larger the bar, the less your odd of getting PD. However, if the bar is red, than this gene can cause you a problem. You can click on the coloured bar. If you do so, underneath the table, you will get explanation of that specific gene. If you click on the GBA gene, you can see that it concerns the N370S mutation.
I hope with this info you can figure out what gene is causing the problem. If PD is in your family, your 23andMe results probably will show you one of the genes with a large red bar. If you need more help figuring out your results ... just ask.