The attachment under the link I did post is safe. thats the pdf file of WS2 servicemanual that I downloaded from that link.
12 pages.
I also have downloaded the servicemanual for WK4, but it's too big to upload here. (16,2 MB).

welcome to the SZ forum, I can see this is your first post. smile

I managed to compress the file into 5mb, so here it is.

GEM WK4 Service Manual-compressed.pdf (5 downloads)

Cheers 🥂
"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)