The mechanism doesn't work now. Nothing appears to happen after all the turrets are destroyed.

I can confirm this bug. It was working earlier yesterday, but then stopped working late last night (or early this morning I guess). Turret 7 is also missing, although I'm not sure if that is related. Maybe it thinks turret 7 still needs to be killed even though it seems to have disappeared? Also, no one remembered killing turret 7 last night.

I already posted in depth about this in General and got a dev response... now that I think about it it was actually like turret 6 or something that respawned first. I must have thought it was turret 7 because that was the first one that was off the sensor log. This makes sense because we killed turret 8 first, actually, because it was the missile turret, then before we killed the last gauss turret (the first gauss turret must have been 6) 8 respawned and it ended up being the last one killed.

I restarted the sector and it should be conquerable again.

Yup. Worked. Thanks, ray.