You know, if there was a system in the Pleiades in which UAs were appearing as SSSs, like they used to, then that system would immediately shoot to the top of my list of potential candidates for weird on-planet goings-on...
It might only be one or two. It might only be in proximity to the planet in question.
I think Operation Scour investigated as much as possible about Merope, including Signal Sources - but what about since Horizons and the Barnacle thing? Is there a planet in Merope around which UAs appear in SSS? If so, is that planet landable? If so, does the surface of that planet harbour the Barnacles?
When I head to Merope on Monday, I'm definitely going to be checking out any SSS I come across, I think. (Until I get beasted by a giant wing of pirates and run away at least!)
Could well be a dead-end, but if correct, then it won't take long to rule out, assuming the spawn rate of such SSS is similar to what it is in the shell.
Would also mean 1.5 CMDRs can join in for part of this.
Just a thought
