According to the this [http://www.sew4less.com/product/9326/Bernina_Service_Manual_1000_1001_1004_1005_1006_1008_1010_1011_1020_1030_1031|website], the service manual for the 1020/1030 might be the same for the 1001/1008. However, this [http://www.sewingmanuals.com/Sewing_Machine_Manuals/Bernina_Service.htm|website] says the 1020/1030 service manual is different from the 1000/1004/1005/1010/1015 service manual in direct contradiction to the previous website.
Here is the service manual for the 1020/1030: https://data2.manualslib.com/pdf5/106/10600/1059902-bernina/1030.pdf?9fc73d80be994a7591153afd28834359. Hopefully, this will be of some help, as I've been unable to find a free copy of the service manual for the 1001/1008.