Well I started from the top of other known issues and went here first:
Lookin a little below the normal levels huh. So I got out the borescope and popped it in through the vacuum port on the back of the intercooler and poked around a bit.
There were a couple weird/rusty looking fins but otherwise didn't see any white deposits or anything too odd in the top end.
I did come across what looks like a crack in the plastic end tank, but I don't see how that could be causing a leak.
Since I didn't see much I went lower into the j-pipe and did finally find a few white spots/deposits inside. Feels like at the very least, I have a slow coolant leak.