Mmmm. Do we know that UA and UP are both necessary for the UL to appear? Are the UL being manufactured in that side chamber or just pulled off a storage rack (this sounds more likely to me).
If you're correct in that 1-- indicates the Unknown Device (and we were told that the UP is the key, i.e. usage instructions), then how does the UD fit into the UP sonogram lower left quadrant? What is it supposed to indicate?
Nope. I got my UL with just a UA in Solo. Thing is I dropped out of supercruise at =~39k away from the site and flew in and, frankly, I've noticed some weirdness with planetary things (e.g Capital Ships in low orbit) if you approach from a distance. During that "instance" I went in and got no ULs. I went back to my ship, relogged, went straight there from 50m outside the door where i relogged in, and ULs dropped instantly with my one UA.