There is a useful fuse chart thread, it looks like #10 is also in the interior lights and boot light circuit, which makes sense as the EWS needs signals on the open/closed state of the doors and boot. I'd be looking at interior/boot lights and switches for signs of a short, or someone having cut in to the line for an accessory?
https://z4-forum.com/forum/viewtopic.php?t=38888